China-Burma-India (CBI) US Engineer : The Ledo Road



P102On December 1 1942, Gen Sir Archibald Wavell (UK), the supreme commander of the Far Eastern Theater, agreed with Gen Joseph Stilwell (US) to make the Ledo Road an American Northern Combat Area Command operation (NCAC). This road was intended to be the primary supply route to China and was built under the direction of Gen Stilwell from the railhead at Ledo (Assam, India) to Mong-Yu road junction where it joined the Burma Road. From there trucks could continue on to Wanting on the Chinese frontier, so that supplies could be delivered to the reception point in Kunming, China. Stilwell’s staff estimated that the Ledo Road route would supply 65000 tons of supplies per month, greatly surpassing tonnage then being airlifted over the Hump to China. Gen Claire Lee Chennault, CG of the US Fourteenth Air Force, thought the projected tonnage levels were overly optimistic and doubted that such an extended network of trails through difficult jungle could ever match the amount of supplies that could be delivered with modern cargo transport aircraft.
Sgt-Warren-WeidenburnerIn a wonderful Tribute Carl Weidendruner has put on Comcast about his father Sgt Warren Weidenbruner (photo), this is the intro he started with : [… The US began to help China defend itself against Japanese aggression even before the attack on Pearl Harbor. President Franklin D. Roosevelt approved lend-lease aid for China in April 1941, and in June the US began sending fighter planes, spare parts, and gasoline. The War and Navy departments also released over 100 pilots to form the American Volunteer Group, popularly called the Flying Tigers. A month later, the War Department established an American military mission to oversee the aid.
Approving aid to China was one thing, but getting it there was another. Japan had already seized China’s coastal provinces and the Japanese move into northern Indochina in September 1941 had cut the railroad from there to Yunnan Province. That left the route from Rangoon in Burma to Yunnan as the only land supply line available to the Americans.
When the Japanese threatened that route, Brig Gen John Magruder, the US lend-lease administrator in China, sent engineer Maj John E. Ausland to look for an alternate route to China from India through northern Burma. Ausland reported that the terrain there was very difficult, especially in the Patkai Mountains along the Burma-India border. When America’s entry into the war brought a request from Generalissimo Chiang Kai-shek for an American general officer to be his chief of staff, the US sent Gen Joseph W. Stilwell. He was also named CG of the US Army Forces in the China-Burma-India theater of operations (CBI).



General Joseph Stilwell, pictured here with Generalissimo Chiang Kai-shekIt was as CoS that Stilwell got first involved in theater operations. The Japanese seized Rangoon in March 1942 shortly after he arrived, and Chiang sent Chinese troops into Burma. He asked Stilwell to coordinate their use with the British, who were responsible for the defense of the area. This first Burma campaign was a losing effort. Stilwell walked out of Burma in May 1942 bringing with him to India the remnants of two Chinese divisions. He still had the mission of supporting China, but he no longer had a land supply line; the Japanese offensive had cut the Burma Road. Stilwell would have to clear a path for a new road right through the terrain Maj Ausland had found so difficult. Only now there was an additional challenge; the Japanese occupied most of the terrain. By the fall of 1942, Stilwell had a plan. The British agreed to a North Burma campaign to clear the road route and assigned the area to Stilwell. In November Chiang Kai-shek approved the use of the Chinese forces and named Stilwell their commander. Gen George C. Marshall, CoS US Army, promised Stilwell absolute priority for troops and equipment second only to the North African campaign, but soon found he could not keep that promise.


Stilwell’s operations officer, Lt Col Frank D. Merrill, recommended building a road from Ledo in Assam Province, India, south and east across northern Burma to a junction with the old Burma Road. The new road would support a North Burma campaign and, when linked with the old, provide a land supply line to China. Merrill chose Ledo because it was near the terminus of the rail line from Calcutta and was at the northern end of a caravan route out of Burma. The concept was for US Army Engineers to build a road generally following the caravan route from Ledo south through the Patkai Mountains and the Hukawng and Mogaung valleys, to connect with the old Burma Road east of Bhamo.


The proposed route for the road went through some of the most difficult terrain in the world. The triangular-shaped territory of northern Burma included jungle-covered mountains and swampy valleys. It was virtually uninhabited with the major towns being nothing more than frontier posts. The mountains, offshoots of the Himalayas, were formidable land barriers that rose to heights of 8000 to 10000 feet. The Hukawng and Mogaung valleys were tropical rain forests, dark and silent, with matted undergrowth where the clearings were really swamps covered with elephant grass 8 to 10 feet tall.

According to Dr Gordon Seagrave, the famed “Burma Surgeon”, this unattractive area was the ancestral home of the leech. He found three major types :

  • big brown ones on the ground
  • red ones in the elephant grass
  • green on the tree branches.

While the leeches were pests, the malaria bearing mosquitoes and typhus-carrying mites could be deadly in the absence of strict preventive medicine measures. There are two seasons in northern Burma, wet and dry. The wet monsoon season lasts from May to October when the rainfall is heavy, averaging 140 inches in the mountains and 120 inches annually in the valleys. By comparison, the east coast of the United States gets about 45 inches in a year. Although the monsoon season produces hot, humid weather, the dry season is a very comfortable period of California-type weather. While the terrain and weather were formidable barriers for the engineers to overcome, the enemy initially posed less of a problem. After the Japanese conquered central Burma 330 Builders and Fighters in early 1942, they consolidated their position during the monsoon season and did not move forces north of Myitkyina. Lt Gen Renya Mutaguchi’s veteran 18th Division, conquerors of Singapore, outposted the area but made no movement north in the Mogaung Valley.

The Burma Road built by the Chinese


The Chinese troops, who would face this Japanese force in the North Burma campaign, began training in India in the summer of 1942. To support them, Gen Stilwell organized a Service of Supply (SOS) under the command of Maj Gen Raymond A. Wheeler. Stilwell had known Wheeler as one of his language students at West Point and had developed a high opinion of his engineering abilities. A career Army engineer, Wheeler had won recognition as a road builder while commanding the 4th Division’s engineers in the Argonne Forest campaign in World War I. Stilwell made SOS responsible for construction in India and Burma. In response to Wheeler’s request, the War Department sent him the 45th Engineer General Service Regiment and the 823d Engineer Aviation Battalion. The two units arrived at Karachi, India, in July. They did not have any of their equipment and had to use lend-lease stock earmarked for China, but they were on the ground, in the theater.

American Army units assigned to the Ledo Road

  • 45th Engineer General Service Regiment
  • 71st Engineer Light Pontoon Company
  • 75th Engineer Light Pontoon Company
  • 77th Engineer Light Pontoon Company
  • 93rd Engineer General Service Regiment
  • 195th Engineer Dump Truck Company
  • 209th Engineer Combat Battalion
  • 236th Engineer Combat Battalion
  • 330th Engineer General Service Regiment
  • 352nd Engineer General Service Regiment
  • 479th Engineer Maintenance Company
  • 497th Engineer Heavy Shop Company
  • 797th Engineer Forestry Company
  • 823rd Engineer Aviation Engineer Battalion
  • 848th Engineer Aviation Engineer Battalion
  • 849th Engineer Aviation Engineer Battalion
  • 858th Engineer Aviation Engineer Battalion
  • 1327th Engineer General Service Regiment
  • 1359th Engineer Dump Truck Company
  • 1388th Engineer Forestry Company
  • 1575th Engineer Heavy Shop Company
  • 1875th Engineer Aviation Battalion
  • 1883rd Engineer Aviation Battalion
  • 1905th Engineer Aviation Battalion
  • 4023rd Quartermaster Dump Truck Company
  • 4024th Quartermaster Dump Truck Company

Note : from the middle of April until the middle of May 1944, A Co of the 879th Airborne Engineer Battalion worked 24 hours a day on the Ledo Road, construction of their base camp and Shingbwiyang airfield, before deploying to Myitkyina to improve the facilities of old British airfield recently captured from the Japanese.

Zones Repartition – May 1945

Ledo-Road-Districts-RepartitionDistrict One (D1)
352nd EGS Regt
93rd EGS Regt
849th EA Bn

District Two (D2)
45th EGS Regt
75th ELP Co
1327th EGS Regt

District Three (D3)
10th Chinese ER
77th ELP Co
330th EGS Regt
823rd EA Bn
1359th EDT Co
1883rd EA Bn
1875th EA Bn
4023rd QMDT Co

District Four (D4)
12th Chinese ER
71st ELP Co
195th EDT Co
209th EC Bn
236th EC Bn
1905th EA Bn
4024th QMDT Co

Road Headquarters
479th Engineer Maintenance Co
497th Engineer Heavy Shop Co
797th Engineer Forestry Co
1388th Engineer Forestry Co
1575th Engineer Heavy Shop Co
Swamill Crew (45th Engineer) at Shingbwiyang


Wheeler established Base Section 3 at Ledo, made it responsible for building the road, and named the 45th Regiment’s commander, Col John C. Arrowsmith, as base commander. Arrowsmith had his own 45th Regiment and the 823d Engineer Aviation Battalion begin the road project, putting them to work first building warehouses, hospitals, barracks, and base roads at Ledo. Work started on the first 103 mile (166 km) section of the road in December 1942, followed a steep, narrow trail through territory from Ledo, across the Patkai Range through the Pangsau Pass, nicknamed “Hell Pass” for its difficulty, and down to Shingbwiyang, Burma. Sometimes rising as high as 4500 feet (1400 m), the road required the removal of earth at the rate of 100000 cubic feet per mile (1800 m³/km). Steep gradients, hairpin curves and sheer drops of 200 feet (60 m), all surrounded by a thick rain forest was the norm for this first section. The first bulldozer reached Shingbwiyang on Dec 27 1943, three days ahead of schedule. The building of this section allowed much-needed supplies to flow to the troops engaged in attacking the Japanese 18th Division, which was defending the northern area of Burma with their strongest forces around the towns of Kamaing, Mogaung, and Myitkyina. Before the Ledo road reached Shingbwiyang, Allied troops (the majority of whom were American-trained Chinese divisions of the X Force) had been totally dependent on supplies flown in over the Patkai Range. As the Japanese were forced to retreat south, the Ledo Road was extended. This was made considerably easier from Shingbwiyang by the presence of a fair weather road built by the Japanese, and the Ledo Road generally followed the Japanese trace. As the road was built, two 10 cm (4 inch) fuel pipe lines were laid side by side so that fuel for the supply vehicles could be piped instead of trucked along the road.

The 45th began work with six D-4 bulldozers and no blades, but it managed to borrow one from a British engineer unit. As a result, the first part of the road was rather winding as the D-4 was too light for the rugged terrain and had to detour around obstacles. The 45th was also short of heavy rock crushers, but it did have 11 portables which it set up at the Tirap River near Ledo.

By the first of the new year, the engineers were working around the clock and making good progress. The 823d’s full complement of equipment had finally arrived and the unit pushed forward rapidly toward the Patkai Mountains. As it moved into the hills, progress slowed due to the difficult terrain. Continuous use of equipment without periodic maintenance and a shortage of spare parts contributed to the slowdown. In February 1943, the engineers reached Pangsau Pass where rock outcroppings caused the 823d to increase its use of explosives. In one case, it was necessary to place charges 30 feet up a perpendicular rock face. Here one engineer hung by a rope lowered from the top to place dynamite that another engineer tossed up to him; an efficient but dangerous technique.

Ledo Road, Burma 1944, Sgt CG McCutcheon of 1304th Engineer Construction

Bulldozers on the Ledo Road

Through February, the 823d pushed for the India-Burma border. A Company broke trace, B Company put in culverts, and C Company widened and ditched the roadway. Only construction vehicles were allowed in the forward area. When Pvt Morris Humphrey stopped the SOS commander’s jeep, Gen Wheeler commended him for carrying out his orders and walked the 2 miles to the roadhead. From long experience “Spec” Wheeler knew the ways and whims of engineers.

The 823d reached the border on Feb 28. As the lead bulldozer crossed into Burma, a bugler sounded To the Colors, and the 823d and the 45th Engineers held a retreat parade. Then they put up a sign : WELCOME TO BURMA – THIS WAY TO TOKYO. In March, the Chinese 10th Independent Combat Engineer Regiment arrived at Ledo from its Ramgarh, India, training base. Without equipment, the unit was outfitted with hand tools and trucks and sent to the roadhead to help clear the trace. Later, when its equipment arrived, the 10th became one of the best construction outfits on the road. March also brought early monsoon rains, and that meant trouble for the engineers. By the first week in April, the monsoon was in full swing. As the rains poured down, the engineers were constantly wet, equipment skidded off the road into ditches, and even pack animals could not transport food and gasoline to the roadhead. Airdrops became necessary for re-supply.

Galahad, 5307 Composit, Merril’s Marauder on the Ledo Road

Eck dum, eck dum, the monsoon’s come
The basha walls are drawn,
When strong men mutter, grim and glum,
‘We’ll all be drowned by dawn’.
They decko through the water spout,
Observing with a grin
The flying dhobi, flying out,
To fetch his washing in !

The fruit wallah has jildi jowd
Complete with nuts and mangoes,
The car-wallah was heard to mutter,
‘You’ve had your egg banjos’

The QM sorting suits,
Gave a loud and horrible sigh
As several pairs of army boots,
Float by before his eyes.

It is time to hit the charpoy,
And get below your net.
The flying ants will soon be here
And other things, I bet.

Eck dum, eck dum, the monsoon’s come
No use to sigh or sob !
just fill the mugs with char, old pal,
And talk about demob.

charpoy = rope bed – decko = look – dhobi = laundry – wallah = servant


The Japanese now reacted to the road construction. With the threat of an Allied offensive, the Japanese formed a second army in Burma and placed the 18th Division Commander, Gen Mutaguchi, in charge. Lt Gen Shinichi Tanaka took over command of the 18th Division. Reacting to guerrilla activity by Kachin tribesmen, small columns from the 18th moved north up the valleys from Myitkyina toward the Patkais and the Ledo Road. The Japanese had trouble with the terrain, and air strikes caused the contractors who provided the elephants for the pack trains to desert with their animals. Short of supplies, the Japanese withdrew south.

After the initial section to Shingbwiyang, more sections followed : Warazup, Myitkyina, and Bhamo, 372 miles (600 km) from Ledo. At that point the road joined a spur of the old Burma road and, although improvements to further sections followed, the road was passable. The spur passed through Namkham 439 miles (558 km) from Ledo and finally at the Mong-Yu road junction, 465 miles (748 km) from Ledo, the Ledo Road met the Burma Road. To get to the Mong-Yu junction the Ledo Road had to span 10 major rivers and 155 secondary streams, averaging one bridge every 2.8 miles (4.5 km).

Work continued through 1944 in late December it was opened for the transport of logistics. In January 1945, four of the black EABs (along with three white battalions) continued working on the now renamed Stilwell Road, improving and widening it. Indeed, one of these African American units was assigned the task of improving the road that extended into China.


For the first convoys, if they turned right, they were on their way to Lashio 100 miles (160 km) to the south through Japanese-occupied Burma. If they turned left, Wanting lay 60 miles (100 km) to the north just over the China-Burma border. However, by late 1944, the road still did not reach China; by this time, tonnage airlifted over the Hump to China had significantly expanded with the arrival of more modern transport aircraft.
In late 1944, barely two years after Stilwell accepted responsibility for building the Ledo Road, it connected to the Burma Road though some sections of the road beyond Myitkyina at Hukawng Valley were under repair due to heavy monsoon rains. It became a highway stretching from Assam, India to Kunming, China 1,079 miles (1736 km) length. On January 12 1945, the first convoy of 113 vehicles, led by Gen Pick, departed from Ledo; they reached Kunming, China on February 4 1945. In the six months following its opening, trucks carried 129000 tons of supplies from India to China. Twenty-six thousand trucks that carried the cargo (one way) were handed over to the Chinese.
As Gen Chennault had predicted, supplies carried over the Ledo Road at no time approached tonnage levels of supplies airlifted monthly into China over the Hump. The road, however, complemented the airlift. The capture of the Myitkyina airstrip enabled the Air Transport Command “to fly a more southerly route without fear of Japanese fighters, thus shortening and flattening the Hump trip with astonishing results.” In July 1943 the air tonnage was 5500 rising to 8000 in September and 13000 in November. After the capture of Myitkyina deliveries jumped from 18000 tons in June 1944 to 39000 in November 1944.

In July 1945, the last full month before the end of the war, 71000 tons of supplies were flown over the Hump, compared to only 6000 tons using the Ledo Road; the airlift operation continued in operation until the end of the war, with a total tonnage of 650000 tons compared to 147000 for the Ledo Road. By the time supplies were flowing over the Ledo Road in large quantities, operations in other theaters had shaped the course of the war against Japan.


The road was built by 15000 American soldiers (60 percent of whom were African-Americans) and 35000 local workers at a cost of US $150 million. 1100 Americans died during the construction, as well as many more locals. As most of Burma was in Japanese hands it was not possible to acquire information as to the topography, soils, and river behavior before construction started. This information had to be acquired as the road was constructed.

The Ledo Road

The Ledo Bazaar on the Ledo Road

Combat Headquarters on the Ledo Road

006-Hellgate-Bridge-Ledo-Road-(Looking East)
The Hellgate Bridge on the Ledo Road

The Ledo Road west of Hellgate

Ledo Road the Pangsau Pass

Ledo Road at the Thursday River

Loglai on the Ledo Road

Ledo Road, Tincha-Ga

Landing Strip on Ledo Road

Ledo Road South of Tincha Ga

Ledo Road South of Tincha Ga

Ledo Road above Tokyo Y

Tokyo Y on the Ledo Road

017-Gared-Ra-Ledo Road
Gared Ra on the Ledo Road

Ledo Road near Gared Ra

Settlement North of Namlip

Settlement North of Namlip

Ledo Road North of Namyung

Namyung Bridge

Kumkidu Landing Strip along the Ledo Road

Kumkidu Landing Strip along the Ledo Road

Ledo Road between Kumkidu and Nathkaw

Ledo Road at Nathkaw

Ledo Road near Chinglow

Ledo Road between Chinglow and Shingbwiyang

Shingbwiyang Landing Strip

North end of the Landing Strip at Shingbwiyang

Ledo Road – Midway


Sources & Further Reading


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