When did the expansion Washington Senators play their last game?

On September 30, 1971, the Senators (managed by Ted Williams) played their last game, in Washington’s RFK Stadium. With two outs in the ninth inning and leading the Yankees, 7-5, fans swarmed the field and play was unable to be resumed. Thus, the Senators forfeited the game 9-0 to New York. A fitting end to a frustrating period in Washington baseball history. The following year the team became the Texas Rangers.