My dad fought in 1945 as German soldier on the Eastern front when he was 17. He told stories that the Russians would come in two waves. There was the frontline

My dad fought in 1945 as German soldier on the Eastern front when he was 17. He told stories that the Russians would come in two waves. There was the frontline and then a second line who would shoot anybody who turned around. Not sure how true this is but I have read similar stories before.