 Meanwhile, Darwin's regular garrison – the Darwin Mobile Force – was disbanded and as a consequence the battalion received a cadre of experience regular former non commissioned officers who were subsequently commissioned.Initially, this force was known as the Darwin Infantry Battalion, but from 1 November 1941 the title of the 19th Battalion was readopted with the unit having separated from the 20th.During their time as part of the Darwin garrison, the 19th provided a significant part of the Army's contribution to the defence of the town against Japanese attacks; they remained there until September 1942 when they were relieved by troops from the 10th/48th Battalion, which had been transferred from the New South Wales south coast.