On April 10, 1923, Liam Lynch, the Chief of Staff of the Anti-Treaty Irish Republican Army, was killed by Free State forces in the Knockmealdown Mountains during the Irish Civil War. His death marked a significant turning point in the conflict, effectively leading to the end of the Anti-Treaty campaign. Lynch was a prominent figure in the republican movement, having also participated in the War of Independence, and his demise was a major blow to the anti-Treaty side.
