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
Alcatraz Gang Alcatraz Gang The Alcatraz Gang was a group of eleven American prisoners of war (POW) held separately in Hanoi, North Vietnam during the Vietnam War because of their particular resistance to their North-Vietnamese military captors. These eleven POWs were: George Thomas Coker, USN; Jeremiah Denton, USN; Harry Jenkins, USN; Sam Johnson, USAF; George McKnight, USAF; James Mulligan, USN; Howard Rutledge, USN; Robert Shumaker, USN; James Stockdale, USN; Ronald Storz, USAF; and Nels Tanner, USN. These prisoners were held in solitary confinement from 25 October 1967 to 9 December 1969 at a special facility (dubbed "Alcatraz" by Commander Stockdale) in a