A vibrant Spanish Republican flag waves against a clear blue sky in El Puerto de Santa María, Spain.

Before WWII, Spain became a testing ground.

Hitler and Mussolini aided Franco; the Soviets backed the Republic.

World War II: Spanish Civil War—The Rehearsal

A vintage fighter aircraft, P-51 Mustang, flying over coastal landscape with propeller motion blur.

Weapons and tactics, trial by fire.

Both sides used the war to test their most advanced tools. Italy sent more than 70,000 ground troops, plus airmen and aircraft.

World War II: Spanish Civil War—The Rehearsal

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