42nd Battalion (Australia)

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The 42nd Battalion was an Australian Army infantry unit formed in 1915 as part of the Australian Imperial Force. It began at Enoggera near Brisbane and joined the 11th Brigade of the 3rd Division. The battalion earned the nickname the Australian Black Watch because of its Scottish connections and wore the unit colour patch with the distinctive blue bonnet march motto, Blue Bonnets Over the Border.

World War I
The battalion trained in Australia and Britain before reaching the Western Front in late 1916. It fought in major 1917 battles at Messines, Warneton, Broodseinde and Passchendaele, where German gas attacks caused heavy casualties. In 1918 it helped repel the German spring offensive around Morlancourt, then took part in the Battle of Hamel on 4 July. During the Allied push after Hamel, the 42nd Battalion was involved in the advance around Amiens and later the fighting near St Quentin Canal, before the Australian Corps began resting and reorganising. The battalion was disbanded on 22 October 1918 to provide reinforcements for other units. In its service on the Western Front, the 42nd lost about 544 soldiers killed and 1,450 wounded. The battalion’s last man to die in service, Sergeant Robert S. Melloy, died in 1995, long after the war.

Interwar and the Citizens Forces
In 1921, after the AIF was demobilised, the battalion was reformed as part of Australia’s part‑time forces and became known as the 42nd Battalion (Capricornia Regiment). It drew its personnel mainly from central Queensland towns, including Sarina, Carmilla, and Yeppoon, and trained at centres such as Rockhampton and Mount Morgan. The unit adopted the motto Cede Nullius.

World War II
When World War II began, the battalion carried out training until early 1942, when it was mobilised for full‑time service as part of the 29th Brigade, 5th Division. It moved to Queensland for jungle warfare training and then deployed to New Guinea in 1943–44, taking part in the Salamaua–Lae campaign and actions around Mount Tambu. In 1944 it returned to Australia briefly for re‑organisation before being sent to Bougainville in December 1944. The 29th Brigade, including the 42nd, fought through 1945 until the fighting ended, with the battalion finally disbanded on 7 May 1946. Throughout the war it suffered 27 killed and 55 wounded.

Postwar lineage and modern role
In 1948 the 42nd Infantry Battalion, Capricornia Regiment, was re‑formed as part of the Citizens Military Forces (the CMF). The Australian Army reorganised in the 1960s, and in 1960 the 42nd was absorbed into the 2nd Battalion, Royal Queensland Regiment. In 1965 the 42nd was re‑raised as a full battalion within the Royal Queensland Regiment. In 2008, the 42nd Battalion merged with the 31st Battalion, Royal Queensland Regiment, to form the 31st/42nd Battalion, Royal Queensland Regiment, which remains part of the Army Reserve today.

Legacy
The 42nd Battalion left a lasting mark on Australian military heritage, with a history of service in both world wars and a continued lineage through the Royal Queensland Regiment in the Army Reserve.