[1] Tuzo first entered the British Army on 15 July 1939 as a second lieutenant in the Royal Artillery, Supplementary Reserve of Officers,[4] just prior to the outbreak of the Second World War in September.
After a fortnight's training he crossed to France with the 21st Anti-Tank Regiment, Royal Artillery, which was part of the 3rd Infantry Division under Major General Bernard Montgomery.
[1] He was then a war substantive captain and temporary major commanding Y Battery of the regiment consisting of self-propelled anti-tank guns, the original recommendation for his MC mentions his actions at the Albert Canal bridgehead, the attacks on Hechtel, Elst [nl], Sittard and particularly in support of the Coldstream Guards at Wesel; he was slightly wounded three times during this period.
His Gurkha battalions worked to win the "hearts and minds" of the locals, but also participated with the SAS in Operation Claret, which interdicted Indonesian troops as they attempted to cross the border.
[13] In 1972, after consultation with Whitehall, Tuzo ordered Operation Motorman, which sent 30,000 troops into Republican dominated 'no-go' areas of West Belfast and Derry to take back control.
[16] After his service in Northern Ireland ended Tuzo was appointed Commander-in-Chief British Army of the Rhine until 1976, when he was made Deputy Supreme Allied Commander Europe.