From 1 April 1941 to 4 April 1943, Gilsa was commander of the 216th Infantry Division. In the winter of 1941/42 the division was sent to the Eastern Front. Gilsa was promoted to General of Infantry on 1 July 1943. From 11 June 1943 to 23 November 1944 he was Commanding General of the LXXXIX Army Corps, which took part in the Battle of the Scheldt, from 2 October to 8 November 1944. Gilsa was Military Commander of Dresden from 15 March to May 1945. At the end of the war, Gilsa committed suicide.