Alcatraz Island Engineers began fortifying the island, work which continued until 1858, eventuating in Fortress Alcatraz. The island's first garrison at Camp Alcatraz, numbering about 200 soldiers and 11 cannons, arrived at the end of that year. When the American Civil War broke out in 1861, the island mounted 85 cannons (increased to 105 cannons by 1866) in casemates around its perimeter, though the small size of the garrison meant only a fraction of the guns could be used at one time. At this time it also served as the San Francisco Arsenal for storage of firearms to prevent them falling into
Alcatraz Island in popular culture order to break in and stop them. In "The Power of Two", season1, episode 20 of the American television series "Charmed", the evil spirit of a serial killer escapes from Alcatraz Island seeking revenge on his judge and jury. Phoebe and Prue must figure out how to vanquish this evil spirit and prevent his killing again without their sister Piper, who's vacationing in Hawaii. The 2012 television series "Alcatraz" involves prisoners from Alcatraz - which was not closed due to budget reasons, but because all 302 residents mysteriously disappeared on March 20, 1963 - reappearing in the present day, requiring