Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
During the 1977-78 German football season, 1. FC Köln won the Bundesliga and the DFB-Pokal, completing a double. It was the club's 15th consecutive season in the Bundesliga.
Squad
Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply. Players may hold more than one non-FIFA nationality.