The Regiment also began training with mortars and anti-tank weapons.

In August 1941, a ten- Bren-gun carriers Platoon was formed. Under Captain R.R.C. Carter, it trained with the British 2nd Loyals Regiment.

In March 1941, Sir Shenton Thomas, the Colonial Governor of the Straits Settlements, authorised the increase of the Regiment's strength to two battalions. Lt-Colonel J.R.G. Andre in Singapore assumed command of the 1st Battalion.

On 1st December 1941, some of the trained officers and men of the 1st Battalion were drafted to form the 2nd Battalion, under the command of Lt-Colonel F.W. Young.

The Japanese attacked Malaya just one week later.