The AC1 Sentinel was a cruiser tank designed in Australia in World War II in response to the war in Europe, and to the threat of Japan expanding the war to the Pacific or even a feared Japanese invasion of Australia. It was the first tank to be built with a hull cast as a single piece, and the only tank to be produced in quantity in Australia. The few Sentinels that were built never saw action as Australia's armoured divisions had been equipped by that time with British and American tanks.
An AC MkI tank on trials
AC E1 development vehicle with a test turret and 17 pounder gun
The AC I under construction at the Chullora tank annexe
The AC1 Sentinel tank at the RAAC Tank Museum.
The Ordnance QF 2-pounder, or simply "2 pounder gun", was a 40 mm (1.575 in) British anti-tank gun and vehicle-mounted gun employed in the Second World War.
QF 2 pounder set up for firing; the gun commander stands behind the gun and the third crewmember would fetch ammunition.
Mark I carriage, April 1941
Crew inside a Valentine tank loading the gun.
2 pounder in action with British troops. Legs are unfolded.