In the wake of the fall of Rabaul, the Catalinas of Nos. 11 and 20 Squadrons became the RAAF's only offensive weapon against the Japanese. Their raids on Rabaul did little to stem the Japanese advance, and in the following months Port Moresby itself was subjected to increasingly frequent attacks, which destroyed aircraft, facilities, and squadron records. In February 1942, the Short Empires operated by Nos. 11 and 20 Squadrons were transferred to the newly formed No. 33 (Transport) Squadron. No. 20 Squadron lost two Catalinas during patrols on 4 and 6 May; the nine crewmen of the first were later found to have been captured and beheaded; the crew of the second were also captured and subsequently disappeared without trace.