Detectives Brennan and Pearce remained seconded to the AIF until the end of the war. Both were recommended for medals and were awarded the Meritorious Service medal
Sydney Sun, 13 August 1917
National Library of Australia
In March, 1916 a contingent of Detectives, assembled from each of the Australian States om the request of Prime Minister Lyons, sailed on the 'SS Malwa' from Fremantle, bound for Port Said, Egypt where they were to assist the Australian war effort. Western Australia was represented by Detective Grenville Vaughan Purdue; South Australia by Detective W. Nation; Victoria by Detective Brennan; Tasmania by Detective Mansfield; NSW Detective by W.H. Pearce and Queensland by Detective McIvor. Their task was to identify the criminal element amongst the Australian troops, and to provide investigative skills to detect and prosecute criminal offences. Amongst their varied duties was the seeking out of spies and detection of acts of espionage. They arrived in Port Said on 20 April, and remained there until early August. By then, the main front of the war had moved to France, so they were then deployed to the United Kingdom, where they were given similar duties in various cities until most were returned to Fremantle, arriving on the 19 January, 1917. Brennan and Pearce remained seconded to the AIS until the end of the war. Both were recommended for medals and were awarded the Meritorious Service medal.