Alcatraz Island later invalidated the sale and paid Frémont nothing. Frémont and his heirs sued for compensation during protracted but unsuccessful legal battles that extended into the 1890s. Following the acquisition of California by the United States as a result of the Treaty of Guadalupe Hidalgo (1848) which ended the Mexican–American War, and the onset of the California Gold Rush the following year, the U.S. Army began studying the suitability of Alcatraz Island for the positioning of coastal batteries to protect the approaches to San Francisco Bay. In 1853, under the direction of Zealous B. Tower, the United States Army Corps of
Battle of Alcatraz was eventually released from prison in 1973. However, he breached his parole conditions, was sent back to prison and died there from complications from A.I.D.S. in 1988. Increased security measures ensured that there were no more escape attempts until 1956. Several versions of the events of the Battle of Alcatraz have been depicted on film: Battle of Alcatraz The Battle of Alcatraz, which lasted from May 2 to 4, 1946, was the result of an unsuccessful escape attempt at Alcatraz Federal Penitentiary. Two corrections officers—William A. Miller and Harold Stites—were killed along with three of the inmates. Eleven corrections officers