Normandy landings, Normandy Invasion, D-Day Invasion, Operation Overlord, or Operation Neptune. Whichever you call it, it still refers to the largest seaborne invasion in history when the Allied forces began the liberation of France on June 6, 1944. In preparation for the large Allied invasion operation, the engineers and designers had to work hard to come up with a variety of machines and vehicles that would bring the operation to succeed. So they created different vehicles with different specialties, weaponry, and other details. The result was unique and specifically modified vehicles made to help the Allies achieve their main objective: To liberate France.

Many of the tanks used that day could be categorized as Hobart Funnies: named after the British General Percy Hobart. He came up with the idea of producing many tanks based on the chassis of the British Churchill and the American Sherman.

Here are some of the results.

Of course, you’d expect to see a DD tank on a D-Day Invasion, although the DD here actually stands for Duplex Drive or, if you’re feeling silly, Donald Duck. The Sherman Duplex Drive tank was made to be waterproof and had a secondary propulsion system to bring it onto the beaches of Normandy. It worked with the help of the “flotation screen” or inflatables that skirted around the tank to enable it to float, while the two propellers powered by the tank’s engineer allowed it to be driven in the water. While in the water, it could travel at about 4 knots and could do so in waves up to around 1 ft.