Alcatraz Citadel Bay and California State could be taken under its fold was thwarted. Alcatraz was officially designated as a military prison on August 27, 1861. In March 1863, when there was a threat that the San Francisco Bay would be captured by the Confederates, the schooner, which was to carry out the operation set sail; the U.S. Navy prevented the schooner from moving out and captured the crew along with ammunition and 15 confederates who were hiding in the galleys of the ship. Consequent to this, the importance of Alcatraz increased, more and more confederates and civilians were arrested for reasons
Alcatraz Federal Penitentiary Robert Franklin Stroud (the "Birdman of Alcatraz"), George "Machine Gun" Kelly, Bumpy Johnson, Rafael Cancel Miranda, Mickey Cohen, Arthur R. "Doc" Barker, Whitey Bulger, and Alvin "Creepy" Karpis (who served more time at Alcatraz than any other inmate). It also provided housing for the Bureau of Prisons' staff and their families. A total of 36 prisoners made 14 escape attempts during the 29 years of the prison's existence, the most notable of which were the violent escape attempt of May 1946 known as the "Battle of Alcatraz", and the arguably successful "Escape from Alcatraz" by Frank Morris, John Anglin, and