The Chargers began life in Los Angeles as part of the AFL, but in a bid to reach a wider fan base, the team moved to San Diego. They moved back to Los Angeles after the 2016 season.
The Pittsburgh Steelers began playing the Chargers in 1970 when the NFL merged with the AFL. Unfortunately for the Chargers it was the beginning of the Steelers Super Seventies and Pittsburgh won the first three contests including a 38-21 victory in 1974 when the Steelers won their first Super Bowl.
The Steelers began the defense of their first championship title with a trip to San Diego for the 1975 season opener.