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 Library Federal Bureau of Prisons booklet in 1960: "These men read more serious literature than does the ordinary person in the community. Philosophers such as Kant, Schopenhauer, Hegel, etc. are especially popular." Other authors include Jack London, Sinclair Lewis, Washington Irving, Zane Grey, Hamilton Garland, Alexandre Dumas, Daniel Defoe, Joseph Conrad, Cervantes and magazines such as "Adventure to Time", "Better Homes and Gardens" and "Library Digest". A law library was later added to A-Block. A library scene in Alcatraz appeared in the 1979 Clint Eastwood film "Escape from Alcatraz" in which Eastwood's character of Frank Morris converses with another inmate. Alcatraz