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  2. Feb 27, 2015 · Alcatraz Military Timeline. 1775. Spanish explorer Lt. Juan Manuel de Ayala maps San Francisco Bay and names an island "de los alcatraces". 1848. California becomes U.S. property at the end of the Mexican-American War. Gold is discovered along the American River and the Gold Rush begins. 1850.

  3. In 1853, under the direction of Zealous B. Tower, the United States Army Corps of Engineers began fortifying the island, work which continued until 1858, when the initial version of Fort Alcatraz was complete. The island's first garrison, numbering about 200 soldiers, arrived at the end of that year.

  4. Nov 30, 2022 · In 1907 Alcatraz officially ceased being a fortress and became Pacific Branch, U.S. Military Prison. Military Prison Alcatraz Island's use as a prison began in December 1859 with the arrival of the first permanent garrison.

  5. In 1853, under the direction of Zealous B. Tower, the United States Army Corps of Engineers began fortifying the island, continuing until 1859, at cost of $87,698 [4] [5] The start of construction was a citadel, in this case meaning a lightly fortified barracks, at the top of sandstone rock outcrops.

  6. In the following decade, Alcatraz would begin serving as a military prison during the Civil War, housing Confederate sympathizers, privateers, and POWs. For the remainder of the 19th century and into the early 20th century, Alcatraz continued expanding its capacity as a military detention facility.

  7. May 18, 2020 · Following the Mexican-American War, President Milliard Fillmore recognized the island’s strategic military value and ordered Alcatraz Island to be set aside as a military reservation. Construction of Fort Alcatraz was completed in 1858.

  8. In 1850 Alcatraz was declared a military reservation by President Millard Fillmore, and by 1859 troops were permanently garrisoned at the post on Alcatraces for the defense of the Bay Area.