See:

Autobiography of Samuel S. Hildebrand: The Renowned Missouri Bushwhacker
edited by Kirby Ross, Daniel E. Sutherland Page 198

https://books.google.com/books
id=6sUvDAAAQBAJ&pg=PA198&lpg=PA198&dq=Confederate+soldier+William+Cato&source=bl&ots=x06q2dovZ4&sig=ACfU3U3niW_7pAHf5DtzO9R5KpA3clJWfg&hl=en&sa=X&ved=2ahUKEwiUoea64ozqAhVBgK0KHRm_CHkQ6AEwBHoECAkQAQ#v=onepage&q=Confederate%20soldier%20William%20Cato&f=false

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William Cato, Private, Company C, 15th Missouri Cavalry, among troops surrendered by BGen. M. Jeff, Thompson May, 1865, paroled at Jacksonport, Arkansas, June 5, 1865, enlisted in Missouri, age 30, blue eyes, light hair, fair complexion, height 5 feet, 10 inchea, born in Missouri [No further information]

NARA M322. Compiled service records of Confederate soldiers from Missouri units