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In page Irish Republican Army (1919–1922):

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The most high-profile violence of the war took place in Dublin in November 1920 and is still known as Bloody Sunday. In the early hours of the morning, Collins' "Squad" killed 14 British spies. In reprisal, that afternoon, British forces opened fire on a football crowd at Croke Park, killing 14 civilians. Towards the end of the day, two prominent Republicans and a friend of theirs were arrested and killed by Crown Forces.[citation needed]