After a short training, he joined the 1st Brigade of Polish Legions, in which he was a soldier of the 1st battalion company. Then he was assigned to the marching battalion of captain Leon Berbecki and in his ranks took part in December 1914 at the Battle of Łowczówek. He was wounded and captured by the Russians. He escaped from it in June 1915, after which he managed to get back to his unit. In October wounded again, then he underwent treatment in the hospital.