After the Russian campaign of 1812, there was a need for experienced officers and Delmas requested and was returned to active duty. Taking command of the 9th Division of Ney's III Corps, he led the division into combat at the Battle of Bautzen. He later fought at the Battle of the Katzbach and then the Battle of Leipzig. During the Battle of Leipzig a cannonball struck him in the right hip and he was taken to the hospital, dying of his wounds two weeks later.