As its numbers dwindled, in February 1919, just before the unit's final cadre began their journey home, it was amalgamated with the 101st Howitzer Battery.

As a Militia formation, the 103rd Battery could not be deployed overseas to fight after the outbreak of the war, and while some of its members volunteered for service with the Second Australian Imperial Force it remained in Australia.

The following year, the battery was deployed to Camp Terendak in Malaya as part of Australia's involvement in the Malayan Emergency and then later the Confrontation with Indonesia.

It remained deployed until October 1963 and upon its return to Australia was relocated to Holsworthy, New South Wales, where it became part of the 1st Field Regiment, Royal Australian Artillery.

During their year-long deployment, the battery fired a total of 28,468 rounds, with its most significant action coming on 18 August 1966, when it supported D Company, 6 RAR during the Battle of Long Tan.

[8] The battery returned to Australia in May 1967, at which point it became an independent unit based at Holsworthy, supporting the School of Artillery and undertaking ceremonial duties.

On their return in mid-2000, the battery, along with the rest of the 8th/12th Medium Regiment relocated to Darwin, Northern Territory, where it became part of the 1st Brigade.

The battery continues to form part of this formation, and since its move as deployed personnel to East Timor, Rifle Company Butterworth, the Solomon Islands, Iraq and Afghanistan and currently operates 155-mm M777A2 howitzers.