What Al Pacino movie portrayed a bank robbery which took place on August 22, 1972?

"Dog Day Afternoon" is a 1975 American crime drama film directed by Sidney Lumet, written by Frank Pierson, and produced by Martin Bregman and Martin Elfand. The film stars Al Pacino, John Cazale, Charles Durning, Chris Sarandon, Penelope Allen, James Broderick, Lance Henriksen, and Carol Kane.

On August 22, 1972, first-time crook Sonny Wortzik (Al Pacino), his friend Salvatore "Sal" Naturale (John Cazale), and Stevie (Gary Springer) attempt to rob the First Brooklyn Savings Bank. The plan immediately goes awry when Stevie loses his nerve shortly after Sal pulls out his gun, and Sonny is forced to let him flee the scene. In the vault, Sonny discovers that he and Sal have arrived after the daily cash pickup, and only $1,100 in cash remained in the bank.

The film is based on the story of John Wojtowicz and adheres to the basic facts of what happened, according to the LIFE article "The Boys in the Bank". Wojtowicz, along with Sal Naturale, held up a Chase Manhattan Bank branch in Gravesend, Brooklyn, on August 22, 1972.