Following several weeks of air attacks and a short naval bombardment, soldiers of the Australian 24th Brigade were landed on Labuan from American and Australian ships on 10 June. The Australians quickly captured the island's harbour and main airfield. The greatly outnumbered Japanese garrison was mainly concentrated in a fortified position in the interior of Labuan, and offered little resistance to the landing. The initial Australian attempts to penetrate the Japanese position in the days after the invasion were not successful, and the area was subjected to a heavy bombardment. A Japanese raiding force also attempted to attack Allied positions on 21 June, but was defeated. Later that day, Australian forces assaulted the Japanese position. In the following days, Australian patrols killed or captured the remaining Japanese troops on the island. A total of 389 Japanese personnel were killed on Labuan and 11 were captured. Australian casualties included 34 killed.