[2] On 8 March the brigade was augmented with the addition of another cavalry unit, the 2nd County of London Yeomanry (Westminster Dragoons),[3] and the following day another armoured regiment, the 1st Lothians and Border Yeomanry was added,[3] and the brigade also became part of the 11th Armoured Division, alongside the 29th Brigade,[2] for training, under the command of Major-General Percy Hobart, and operating the Valentine tank.

Soon after, on 22 March, the 2nd Queen's Westminsters were renamed the 12th Battalion, King's Royal Rifle Corps.

[4] Duncan would command the brigade during its active service from D-Day until after the end of the war in Europe.

By the time of the Normandy landings on 6 June 1944 all three units of the 30th Armoured Brigade were operating the Sherman Crab flail tank, designed to clear paths through minefields and other obstructions.

[7] The 1st Lothian and Border Yeomanry did not arrive in France until 12 July, but soon found itself in action around Caen.

[8] 30th Brigade continued in action for the rest of the war, taking part in several operations, including the assault on Le Havre in September 1944,[9] the invasion of Walcheren ("Operation Infatuate II") in November 1944,[8] and the crossing of the Rhine in March 1945.