During World War I, Hitler served as a dispatch runner for the List Regiment of the Bavarian Army. On the night of 13-14 October 1918, he and his comrades were victims of an Allied mustard gas attack near Ypres, Belgium. They had been leaving their dug-out to retreat when the attack occurred, and were partially blinded by it. Hitler received initial treatment in Flanders, and on 21 October was sent to the military hospital in Pasewalk near Stettin in Pomerania. It was there that Hitler learned that Germany had asked the Allies for an armistice. He also learned that revolution was in the air. Hitler later claimed that it was while recuperating at Pasewalk that he became a virulent anti-Semite, although historians consider this to be unlikely, especially when Hitler referred to his conversion in terms of a vision he received. He left the hospital on 19 November, eight days after the Armistice.