On July 15, 1918, Sandburg’s regiment, the 38th Infantry, successfully held a position 200 yards from the Marne River. The two flanks of the 38th Infantry moved toward the river—squeezing the German attackers between them—and exposing the regiment and the enemy to heavy shelling by the 3rd Division Artillery. With this brave stand, the 38th Infantry earned its nickname “Rock of the Marne.”