Hd-31 (Germany)

A German heavy tank design proposed in 1944. It featured a 128mm gun and exceptionally thick armor, but it was never built due to resource constraints and the war’s end.

Hd-16 (France)

A French heavy tank design developed during World War II. It featured a 90mm gun and even thicker armor than the Hd-15, but it was never built due to the French defeat in 1940.

Hd-9 (Soviet Union)

A Soviet heavy tank prototype developed during World War II. It featured a 122mm gun and thick armor, but it was not adopted due to production difficulties.

Hd-10 (Soviet Union)

A Soviet heavy tank design developed during World War II. It featured a 152mm gun and exceptionally thick armor, but it was never built due to resource constraints.

Hd-11 (United Kingdom)

A British heavy tank prototype developed during World War II. It featured a 17-pounder gun and thick armor, but it was not adopted due to its high cost.

Hd-12 (United Kingdom)

A British heavy tank design developed during World War II. It featured a 20-pounder gun and even thicker armor than the Hd-11, but it was never built due to the war’s end.

Hd-13 (Italy)

An Italian heavy tank prototype developed during World War II. It featured a 90mm gun and thick armor, but it was never deployed due to production limitations.

Hd-14 (Italy)

An Italian heavy tank design developed during World War II. It featured a 105mm gun and even thicker armor than the Hd-13, but it was never built due to the war’s end.

Hd-15 (France)

A French heavy tank design developed before World War II. It featured a 75mm gun and thick armor, but it was never built due to the French defeat in 1940.

Hc-407

A British 25-pounder field gun, one of the most widely used artillery pieces by the British Army during World War II. It was known for its long range and accuracy.