Charlton Athletic's early years were somewhat hindered by the presence of Woolwich Arsenal, who were the closest team in locality and were well supported. Charlton spent the first years of their history playing in non-professional leagues and did not play either Palace or Millwall. Eventually, Woolwich Arsenal moved to North London, losing the 'Woolwich' from their name, in 1913. The same year Charlton adopted senior status. They became a professional team in 1920, joining the Southern League. Both Millwall and Crystal Palace joined the Football League in the 1920–21 season, playing in the Third Division, while Charlton Athletic joined the year after for the 1921–22 season, finally competing at the same level as both their South London neighbours. Wimbledon became a Football League club five decades later in the 1977–78 season, playing their first South London derby against Millwall in 1980.
