After two years of bitter competition and player raiding, the National and American Leagues made peace and, as part of the accord, several pairs of teams squared off for interleague exhibition games after the 1903 season. These series were arranged by the participating clubs, as the 1880s World's Series matches had been. One of them matched the two pennant winners, Pittsburgh Pirates of the NL and Boston Americans (later known as the Red Sox) of the AL; that one is known as the 1903 World Series played at Huntington Avenue Grounds. It had been arranged well in advance by the two owners, as both teams were league leaders by large margins. Boston upset Pittsburgh by five games to three, winning with pitching depth behind Cy Young and Bill Dinneen and with the support of the band of Royal Rooters. The Series brought much civic pride to Boston and proved the new American League could beat the Nationals.