Genealogy / How to find a burial site / records in Poland... [80]

I need help locating my uncle's burial site, Heinrich Muth, who was killed the later part of 1945. He was born in America, but was drafted when his family moved back to Hungary. He was a soldier for the German army. My father believes he had the rank of a Corporal in the Army. Any help with this would be greatly appreciated. My father came to the states in 1949 and has always wondered about his brother. Thank you, Melanie Davis