On 110 years ago today, October 27, 1915 (September 19, 1915 in the lunar calendar), the US military entered the front line of World War I. Gas masks were a must-have equipment for the US military when they went to the front line October 27, 1915. American soldiers began fighting hours after arriving on the front lines. At 6 a.m., the 1st U.S. Infantry Division arrived at the Lorraine Thule sector near Nancy, where it was relatively calm. Almost at the same time, they came under artillery fire from distant German positions, but no casualties were reported. Since June, an average of 50,000 U.S. soldiers have traveled to France every month. They received only three months of combat training from French veterans and immediately went into combat. From his command headquarters in Chaumont, General Pershing maintained direct contact with American forces operating separately from the French and British forces. He will use a single railway line east of Paris to transport troops and munitions supplies. Currently, there are temporary military supply stations for the US military everywhere in France.