The 2/6th Battalion was an infantry battalion of the Australian Army that served during the Second World War. Raised in October 1939 as part of the all-volunteer Second Australian Imperial Force, the battalion formed part of the 6th Division and was among the first troops raised by Australia during the war. Departing Australia in early 1940, the 2/6th were deployed to the Middle East where in January 1941, it took part in the first action of the war by Australian ground forces, the Battle of Bardia, which was followed by further actions around Tobruk. Later, the 2/6th were dispatched to take part in the Battle of Greece, although they were evacuated after only a short involvement in the campaign. Some members of the battalion subsequently fought on Crete with a composite 17th Brigade battalion, and the battalion had to be re-formed in Palestine before being sent to Syria in 1941–42, where they formed part of the Allied occupation force that was established there in the aftermath of the Syria–Lebanon campaign.

The 2/5th Battalion was an infantry battalion of the Australian Army that operated during World War II. It was raised at Melbourne, Victoria, on 18 October 1939 as part of the Second Australian Imperial Force, attached to the 17th Brigade of the 6th Division. The 2/5th was one of only two Australian infantry battalions to fight against all of the major Axis powers during the war, seeing action against the Germans and Italians in Egypt, Libya, Greece and Crete, and the Vichy French in Syria, before returning to Australia in 1942 to fight the Japanese following a period of garrison duties in Ceylon, where it formed part of an Australian force established to defend against a possible Japanese invasion.