 By 1938, the 10th Light Horse had been reassigned as field (non divisional) troops directly assigned to the 5th Military District headquarters; however, they continued to be attached to the 13th Brigade.The brigade was mobilised for war service in 1939 after the outbreak of the Second World War, but due to the provisions of the "Defence Act (1903)" it was initially only used as a garrison force.It was mobilised for full-time service following Japan's entry into the war in December 1941, and undertook collective training at Melville Camp until early 1942.