successful as the five large Japanese submarines sank only three merchant ships and caused minimal property damage during the two bombardments. The performance of the Allied defenders was equally poor. However, one historian states that the lack of damage in Sydney Harbour was due to "a combination of good luck and aggressive counter-attack". The main impact of the midget submarine attack and subsequent operations was psychological; dispelling any belief that Sydney was immune to Japanese attack and highlighting Australia's proximity to the Pacific War. There was no official inquiry into the attacks, despite demand from some sections of the media, as there was concern that an inquiry would lead to defeatism and reduce faith in John Curtin's government, particularly after the damaging inquiry into Australian defences that had followed the Japanese aerial attack on Darwin three months earlier. Failures in Allied defences The Allies failed to respond adequately to several warnings of Japanese activity off the east coast of Australia prior to the attack; they simply ignored the warnings or explained them away. They attributed the unsuccessful attack on the freighter Wellen on 16 May to a single submarine, and assumed it had departed Australian waters immediately after the attack. The first reconnaissance flight went unnoticed, and although FRUMEL intercepted the report and distributed it to Allied commanders on 30 May, Muirhead-Gould apparently did not react. New Zealand naval authorities detected radio chatter between the Japanese submarines on 26 and 29 May, and although they could not decrypt the transmissions, radio direction finding indicated that a submarine or submarines were approaching Sydney. The Allies considered dispatching an anti-submarine patrol in response to the 29 May fix, but were unable to do so as all anti-submarine craft were already committed to protecting a northbound troop convoy. The only response to the second reconnaissance flight on 29 May was the launching of search planes. No other defence measures were put into place. Although the midget attack on Diego Suarez in Madagascar occurred on the morning of 31 May (Sydney time), the Allies sent no alert to other command regions, as they believed that Vichy French forces had launched the attack. Historians have questioned the competence of the senior Allied officers. Muirhead-Gould had been hosting a dinner party on the night of the attack, and one of the main guests was the senior United States Navy officer in Sydney Harbour, Captain Howard Bode