Inouye was promoted to sergeant within his first year, and he was assigned as a platoon sergeant. He served in Italy in 1944 during the Rome-Arno Campaign before his regiment was transferred to the Vosges Mountains region of France, where he spent two weeks in the battle to relieve the Lost Battalion, a battalion of the 141st Infantry Regiment that was surrounded by German forces. He received a battlefield commission to second lieutenant for his actions there, becoming the youngest officer in his regiment. At one point while he was leading an attack, a shot struck him in the chest directly above his heart, but the bullet was stopped by the two silver dollars he happened to have stacked in his shirt pocket. He continued to carry the coins throughout the war in his shirt pocket as good luck charms, until he lost them shortly before the battle in which he lost his arm.