The Battle of the Square (Norwegian: Torvslaget, Swedish: Torgslaget) was a skirmish between Norwegian demonstrators and military forces of the United Kingdoms of Sweden and Norway that took place in Oslo (then called Christiania), Norway, on the evening of 17 May 1829. The demonstrators were participating in the annual celebration of the Constitution of Norway, which had been outlawed by Charles XIV John of Sweden, King of Sweden and Norway, the previous year. The intervention by police and troops provoked outrage in Norway, and forced Charles XIV to lift the prohibition.