The 20th Engineer Regiment operated throughout France. Click on the map to the right to open a new window to see the locations of every company and battalion in the Regiment, as well as the Regimental headquarters in Tours.

The 20th Engineers was the largest regiment ever to exist in the United States Army. From its beginning in 1917, it grew to over 500 officers and 30,000 soldiers by Armistice Day in 1918. The organization included 14 battalions deployed to France, with another 14 battalions and additional company-sized units attached, and 15 more battalions still organizing in the United States. Its missions were among the most diverse of the American Expeditionary Forces, from operating within direct combat range of German forces, to units scattered along the Spanish border; its soldiers were among the first to arrive in France, and among the last to return home. The primary function of the 20th Engineers was forestry--to produce lumber and timber for Allied forces--but its flexibility and command structure allowed for a wide range of other engineer missions.

Click on any of the units shown below to see detailed descriptions of their locations and operations, along with photographs and images of some of their uniforms and equipment.

A short time after the United States declared war with Germany, plans for an adequate force of forest engineers were drawn up. Urged by the Joffre Mission to America by the British Mission by the cabled request of General Pershing, the War Department made the rapid formation of forestry troops one of its primary obligations to the American Expeditionary Forces.

The Allied lines of communication depended upon great amounts of timber and ties; docks, literage, storage facilities, shelter, hospitalization, ice-making plants, bakeries, and fuel. The front lines required lumber for dugouts, trench construction, entanglements, compounds for prisoners, bridges, and a great variety of other uses-even coffins.

The first step taken provided for the organization of the 10th Engineers (Forestry). This regiment, consisting of two battalions of three companies each, was authorized as an emergency measure May 17, 1917, and formally authorized by General Order No 78 on June 27th. The United States Forest Service assumed the task of recruiting the regiment, and many Government foresters answered the call to arms.

The Agriculture Department and its Forest Service helped the War Department recruit professional and trained foresters for the various forestry units that eventually coalesced into the 20th Engineer Regiment. Even the Chief Forester (Henry S. Graves) and Assistant Chief Forester (William B. Greeley) left the Forest Service to join the 20th Engineers.

Click the poster to the left to see a variety of recruiting materials specific to the 20th Engineers, plus a recruiting letter from the Chief Forester.

The 10th Engineers sailed from New York on the "Carpathia" on September 10, 1917, under the command of Colonel James A. Woodruff. The "Carpathia" landed at Glasgow, Scottland; from there the regiment traveled to Southampton, the across the English Channel to Le Havre, then Nevers, where the regiment was dispersed across France to conduct operations. There were some of the first American troops to serve in France.

Soldiers of the 42nd Engineers (later the 42nd, 43rd, and 44th Companies of the 20th Engineers) boarding the USS President Lincoln on May 10th, 1918. The ship landed at Brest, France on May 23rd. On its return trip to the United States, the Lincoln was torpedoed and sank on May 31st.

General Pershing quickly realized the 10th would be insufficient for the size force he envisioned for the AEF. In cable No. 27 on July 4th, 1917, and in several additional cables afterwards, he requested four additional regiments of lumbermen. This request was passed to the War College Division for further study and as a result General Order No. 108 was issued on August 15, 1917, authorizing one regimental headquarters, 10 battalions of forestry engineers of three companies each, and nine engineer service battalions of four companies each.

"European War Mobilization - 20th Regiment Engineers (Forestry)
Camp American University, Washington, D.C. - Oct. 1917"

The 20th Engineer Regiment was formed on September 9, 1917 at American University in Washington, D.C. Major Earl S. Atkinson was in command until relieved on September 15th by Colonel W. A. Mitchell, who had been stationed in the office of the Chief of Engineers working on the regiment's organization. Due to limited capacity at American University, the battalions were organized over a stretch of time, with a few units billeted at Fort Myer and Camp Belvoir, Virginia, for short periods of time.

"Review of the 20th Engineers, by Sect'y of War Baker, at the State, War & Navy Bldg., Washington, D.C."

Units of the Regiment shipped out over a period of time, with the 1st and 2nd Battalions of the 20th Engineers departing for France on November 11, 1917. Part of the 6th Battalion of the 20th Engineers was shipped to France aboard a former British transport ship. With the engineers and others embarked, the SS Tuscania was torpedoed by a German U-Boat off the coast of the Isle of Islay, Ireland. Over 200 US soldiers died in the incident, 95 of them from the 6th Battalion, 20th Engineers. (Photo courtesy of the Saturday Evening Post, March 1918.)

The 20th Engineer Regiment appeared in several editions of the AEF's overseas newspapers, the Stars and Stripes. Click the header above to see a number of the articles. Click the article header to the right to see the November 8, 1918, article about the merger of the forestry regiments.

On October 18, 1918, General Order No. 47 reorganized all U.S. forestry units under the 20th Engineer Regiment, with a planned endstate of 29 battalions. The two battalions of the 10th Engineer Regiment became the 11th Battalion and 12th Battalion, 20th Engineer Regiment. Three former Road and Bridge battalions were also folded into the 20th Engineer Regiment: the 41st Engineer Battalion became the 13th Battalion, 20th Engineer Regiment; the 43rd Engineer Battalion became the 14th Battalion, 20th Engineer Regiment; and the 42nd Engineer Battalion headquarters was disbanded and its companies redesignated. All the lettered companies of the old battalions were renumbered from 1st through 49th Engineer Company (Forestry). See the Reorganization Table. The remaining 15 battalions of the 20th Engineers--another 26,000 men-- were in various states of organization and training at the time of the Armistice, and were never deployed to Europe.

In addition to the organic battalions of the 20th Engineers, there were auxiliary units assigned to the 20th Engineer Regiment, to include seven Engineer Forestry Service Battalions: the 503rd, 507th, 517th, 519th, 523rd, 531st, and 533rd Engineers. These battalions' headquarters were eventually disbanded and the companies redesignated as the 1st through 28th Engineer Forestry Service Companies, and assigned as an organic part of the 20th Engineer Regiment.

In addition to the Engineer Forestry Service Battalions, there were other auxiliary units attached to the Regiment. There were 14 battalion-sized units: two Engineer Service Battalions (the 547th and 548th Engineers), and twelve Quartermaster Battalions (the 309th, 314th, 320th, 323rd, 324th, 328th, 329th, 331st, 332nd, 333rd, 335th, and 342nd Labor Battalions). There were also an assortment of separate company-sized units, including Pack Trains, Wagon Companies, and a Motor Truck Company.

All in all, not counting the units that were never shipped to Europe, the 20th Engineers had more than 500 officers and 30,000 soldiers assigned or attached by the time of the Armistice. It was the only organization in the A.E.F. that had a soldier from every State in the Union.

Companies A and C of 1st Battalion, 20th Engineers published a newspaper "somewhere in France" named Jusqu'au Bout ("To The End," or more probably, "Until It's Over"). Note the banner shows a tree whose trunk resembles Kaiser Wilhelm, with foresters working to take it down. Also shown are stacks of lumber and ties, a train pulling timbers, and files of marching doughboys. Click on the photo to see more images of the paper.

The first operations were in the pinewood nurseries of the Landes, in the valley of the Loire, and in the softwood forests of the Vosges and Jura Mountains. Many of the operations were started temporarily with small mills obtained in France, which were overhauled to increase production above their rated capacities. Practically all the mills were kept going day and night.

Photos from 1st Company (Company A, 1st Battalion), 20th Engineers

Standard gauge railroads up to three miles in length were built at two-third of the operations for connecting the mill docks with French rail lines. Much of the logging was done with horses and mules; motor trucks and tractors were used increasingly as they became available.

Monthly needs of the AEF rose to 50,000,000 board feet of lumber and timber; 250,000 railroad ties; 6,500 pieces of piling and ribbing; 1,500,000 poles and entanglement stakes; and 100,000 cords of fuelwood. Limited quantities of these were obtained from the U.S., France, Switzerland, Norway, and Spain; but the vast majority was produced by U.S. forestry troops.

Detachments of trained woodsmen were needed with the infantry divisions at the front. These often engaged in direct combat with the Germans. Losses included two officers of the 20th Engineers who were killed by German machine gunners.

With the Armistice came a temporary slow-down in operations. Two battalions (the original 10th Engineers) were shipped home quickly, but the rest of the 20th Engineers were delayed to helped reconstruct France. One of these final feats included operations in the famous Burned Area.

Various parts of the regiment were shipped home during the first parts of 1919, with the last units arriving in Hoboken, New Jersey, in July.

Several months after the end of the war, American Forestry, the magazine of the American Forestry Association, dedicated a special commemorative issue in June of 1919 to the work done by the 20th Engineers during World War I. Included in the retrospective were articles written by some of the commanding officers of the forest engineer units, as well as a large number of photographs documenting the work and experiences of the forestry troops.

Click on the photo to see a variety of articles and photos from the magazine.

New! Book on the 20th Engineers in World War 1

Click the picture of the soldier to see personal information on a few of the individuals
that served in the 20th Engineers during the Great War.