High Quality Content by WIKIPEDIA articles! The Battle of the Bismarck Sea (2–4 March 1943) took place in the South West Pacific Area (SWPA) during World War II. During the course of the battle, aircraft of the U.S. 5th Air Force and the Royal Australian Air Force (RAAF) attacked a Japanese convoy that was carrying troops to Lae, New Guinea. Most of the task force was destroyed, and Japanese troop losses were heavy.