The 10th and 50th remained linked until October 1936; at that time, in response to fears of a possible war in Europe following the reoccupation of the Rhineland, it was decided to expand the size of the Militia. As a result, on 1 October 1936, the 10th/50th Battalion was split and the 10th Battalion was re-raised as a separate unit, and was once again assigned to the 3rd Brigade. After Japan's entry into World War II in December 1941, the 10th Battalion mobilised at Warradale to undertake garrison duties in Australia. While the 3rd Brigade's two other battalions – the 27th and 43rd – were sent to Darwin, the 10th was detached to the 28th Brigade, and initially deployed to Warrawong on the New South Wales south coast, defending the strategically important industrial area around Wollongong, but in August it was ordered to join Northern Territory Force and moved to Darwin to defend the port against a possible Japanese invasion. Before it arrived, though, an Army-wide reorganisation resulted in the 10th being amalgamated with the 48th Battalion, to form the 10th/48th Battalion on 27 August 1942.