On October 19, 1944, the 442nd was fighting near Bruyères and Biffontaine in eastern France and over the next ten days, Hajiro, a private in Company I, repeatedly distinguished himself in battle. He exposed himself to enemy fire while assisting an Allied attack on October 19, and three days later he and a comrade ambushed an 18-man enemy patrol. On October 29, during the rescue of the so-called "Lost Battalion", which had been surrounded by German forces in the Vosges Mountains, he single-handedly destroyed two German machine gun emplacements. Afterwards, in another firefight, he was shot in the shoulder and wrist leaving his left arm partially paralyzed. He was able to rejoin the 442nd in Monte Carlo, but was barred from further combat duty. He was then sent back to the United States to recover.