The Bougainville counterattack (also known as the Second Battle of Torokina) was an unsuccessful Japanese offensive against the Allied base at Cape Torokina, on Bougainville Island, during the Pacific War of World War II. The Japanese attack began on 8 March 1944 after months of preparation, and was repulsed by United States Army forces in fighting which lasted until 25 March. The attack was hampered by inaccurate intelligence and poor planning and was defeated by the well-prepared Allied defenders, who greatly outnumbered the Japanese force. The Japanese suffered severe casualties, while Allied losses were light.