http://www.unionguards.org/guards/pubdocs/history-then.pdf
[provides history of Company A and 2 photos of Capt. Isaac May]
"...The original captain was Isaac May, a cabinetmaker from Anderson and a native Virginian ... In an early command shakeup, the 19th’s original lieutenant colonel resigned and was replaced by the original major, Alois Bachman, and Captain May was promoted to major. Alonzo Makepeace became captain of Company A vice May. ... [at Brawner's Farm] Colonel Meredith was injured by his dying horse, and Major May, late of the Union Guards, received a fatal head wound and died on the field. ..."