It begins in late 1917 and early 1918 with small supportive roles to the British Army. The timeline below lists the major operations that the Americans participated in. Most of 1917 was spent training the troops in the US, transporting them to Europe, further training by our French and British allies and then taking over sections of the allied trench line as the units became ready for front line service. The army formed the largest body of troops and consisted of three different organizations: eight Regular Army divisions, seventeen National Guard divisions and eighteen National Army divisions, formed by men drafted for national service. The United States Army and Marine Corps began arriving in France in 1917 following the nation's declaration of war against Germany in April of the same year.
