The King's notably saw active service in the Second Boer War, the two world wars, and the Korean War. In the First World War, the regiment contributed dozens of battalions to the Western Front, Salonika, and the North West Frontier. More than 13,000 men were killed. In the Second World War, the 5th and 8th (Irish) battalions landed during Operation Overlord, the 1st and 13th fought as Chindits in the Burma Campaign, and the 2nd Battalion served in Italy and Greece. The King's later fought in the Korean War, earning the regiment's last battle honour.