By the spring of 1918, the U.S. 1st Infantry Division and several others had already been bloodied during rotations into generally quiet sectors to gain experience, or in support roles with the British Army as the latter sought to contain the Imperial German Army’s Michael offensives. In the last week of April, the 1st Division made the move into the sector that would in a month’s time earn the division national acclaim: Picardy, in northern France, in which province stood the village of Cantigny. The Battle of Cantigny is regarded as the first distinctly American victory of the war.
Benjamin Franklin nailed it when he said, "Fatigue is the best pillow." True story, Benny. There's nothing like pushing your body so far past exhaustion that you'd willingly, even longingly, take a nap on a concrete slab.