July 12, 1807|
East Greenwich, Rhode Island
|Died||January 22, 1882
Brooklyn, New York
|Place of burial||the Casey farm in North Kingstown, Rhode Island|
|Allegiance||United States of America
|Years of service||1826 - 1868|
|Battles/wars||San Juan Dispute
American Civil War
Early life and military career
He fought in the Second Seminole War under William J. Worth from 1837 to 1842. During the Mexican-American War he fought at the Battle of Contreras and Battle of Churubusco, and was appointed brevet major on August 20, 1847 for gallant conduct. He then fought in the Battle of Molino del Rey and was severely wounded during the Battle of Chapultepec on September 13, 1847. In 1880 Casey became a veteran member of the Aztec Club of 1847 - a military society originally composed of officers who had served in the occupation of Mexico City and later extended its membership to all United States officers who had served during the Mexican War and their descendants.  
After the Mexican-American War, he performed frontier duties and escorted topographical parties, including a trip to California around Cape Horn in 1849. He commanded at Camp Picket during the Pig War on San Juan Island from August 10 to October 18, 1859.
Casey was promoted to brigadier general of Volunteers on August 31, 1861, shortly after arriving on the East Coast. He was promoted to colonel in the Regular Army on October 9, 1861. He fought in the Peninsula Campaign, where his division suffered heavy losses at Battle of Seven Pines on May 31, 1862, facing Brig. Gen. George Pickett's brigade. He was promoted to major general of Volunteers in a general promotion of all McClellan's division commanders in August to rank from July 4, 1862.
He wrote the three-volume System of Infantry Tactics, including Infantry Tactics volumes I and II, published by the army on August 11, 1862, and Infantry Tactics for Colored Troops, published on March 9, 1863. The manuals were used by both sides during the Civil War.
At the end of the war, Casey received a brevet (honorary promotion) to the rank of major general date March 15, 1865. He was mustered out of Volunteer service and reverted to his Regular Army rank of colonel on August 24, 1865.
Casey retired from the Army on July 8, 1868 at the age of 61, having served over 40 years on active duty.
In 1870 he became an hereditary member of the Massachusetts Society of the Cincinnati in succession to his uncle Dr. Lincoln Goodale. In 1880 he joined the Aztec Club of 1847 and was succeeded by his son, Silas III, upon his death. General Casey was also a member of the Military Order of the Loyal Legion of the United States as were all three of his sons.
Casey's sons included Silas Casey III, who served as Rear Admiral of the Pacific Squadron, Brigadier General Thomas Lincoln Casey (who oversaw the completion of the Washington Monument and served as Chief of Engineers in the US Army) and Lieutenant Edward Wanton Casey, an Army officer who was killed in action with the Sioux in 1891.
- Constitution of the Aztec Club of 1847 and List of Members. 1909. pg. 34.
- Eicher, p. 167.
- War Department General Order 181 dated 1st November 1862 formalising the Summers' promotions 
- S. Casey (1862) Infantry Tactics, David Van Nostrand, link from Google books
- Memorials of the Massachusetts Society of the Cincinnati, 1890. pg. 212.
- Eicher, John H., and David J. Eicher. Civil War High Commands. Stanford, CA: Stanford University Press, 2001. ISBN 0-8047-3641-3.
- This article incorporates text from a publication now in the public domain: Wilson, James Grant; Fiske, John, eds. (1891). "article name needed". Appletons' Cyclopædia of American Biography. New York: D. Appleton.
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