In 1943 during World War II many NFL players were in the military. Football was having a major shortage of players. Those players who remained were old or had medical problems making them unfit for service.
The Pittsburgh Steelers and Philadelphia Eagles merged their teams creating what the media dubbed "The Steagles." Neither team was very good in the past, but combined they did some amazing things.
Here are some links to the games that the Steagles played:
Pre-season 1
Pre-season 2
Regular season 1
Regular season 2
Regular season 3
Regular season 4
Regular season 5
Regular season 6
Regular season 7
Regular season 8
Regular season 9
Regular season 10