Background
In early 1943, Rabaul had been distant from the fighting. However, the Allied grand strategy in the South West Pacific Area—Operation Cartwheel—aimed to isolate Rabaul and reduce it by air raids. Japanese ground forces were already retreating in New Guinea and in the Solomon Islands, abandoning Guadalcanal, Kolombangara, New Georgia and Vella Lavella.
Rabaul—on the island of New Britain—was one of two major ports in the Australian Territory of New Guinea. It was the main Japanese naval base for the Solomon Islands campaign and New Guinea campaign. Simpson Harbor—captured from Australian forces in February 1942—was known as "the Pearl Harbor of the South Pacific" and was well defended by 367 anti-aircraft guns and five airfields.
Lakunai and Vunakanau airfields were prewar Australian strips. Lakunai had an all-weather runway of sand and volcanic ash, and Vunakanau was surfaced with concrete. Rapopo—14 mi (12 nmi; 23 km) to the southeast—became operational in December 1942 with concrete runways and extensive support and maintenance facilities. Tobera—completed in August 1943 halfway between Vunakanau and Rapopo—also had concrete strips. The four dromes had 166 protected revetments for bombers and 265 for fighters, with additional unprotected dispersal parking areas. The fifth airfield protecting Rabaul was Borpop airfield, completed in December 1942 across the St. Georges Channel on New Ireland.
The anti-aircraft defenses were well coordinated by army and naval units. The army operated 192 of the 367 antiaircraft guns and the navy 175. The naval guns guarded Simpson Harbor and its shipping and the three airfields of Tobera, Lakunai, and Vunakanau. The army units defended Rapopo airfield, supply dumps and army installations; and assisted the navy in defending Simpson Harbor. An effective early warning radar system provided 90 mi (78 nmi; 140 km) coverage from Rabaul, and extended coverage with additional radars on New Britain, New Ireland, and at Buka. These sets provided from 30–60 minutes early warning of an attack.
Read more about this topic: Bombing Of Rabaul (November 1943)
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