The lesser known Irish Bloody Sunday (the other being the Derry 1972 Bloody Sunday) took place during the Irish War of Independence on this day in 1920. On the morning of November 21, Michael Collins’s men killed 14 British intelligence officers. Later that afternoon during a GAA match at Croke Park in Dublin, British forces opened fire on Irish civilians watching the match. 14 civilians were killed, including a GAA player. Later that night, three IRA prisoners were beaten to death at Dublin Castle. It was reported that they were trying to escape.