At the start of the Mexican Revolution in 1913, greedy bandit Juan Miranda and idealist John H. Mallory, an Irish Republican Army explosives expert on the run from the British, join up with a group of revolutionaries intending to smash a national bank. Duck, You Sucker! is a 1971 epic Zapata Western film produced and co-written by Sergio Leone and starring Rod Steiger, James Coburn, and Romolo Valli. It is also known as A Fistful of Dynamite and Once Upon a Time… The Revolution.