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
Legends of Alcatraz occurred in the area that Henri Young had murdered Rufus McCain, stabbing him in the neck. Despite former guards and park rangers revealing their paranormal experiences at Alcatraz, officials for Alcatraz have publicly dismissed the reports of ghosts at Alcatraz as nonsense and deny their existence; an official for Alcatraz said in 1994, "These ridiculous ghost stories will stop tourists from visiting. And how can these people say they heard canaries? We don't have any birds in here." Mary Forgione of the "Los Angeles Times" also stated that "The National Park Service, which operates the island as a tourist site,