When did Union General Issac Ferdinand Quinby graduate from West Point?

Answer 1

Union General Abner Doubleday graduated from West Point in 1842. Among the graduating 56 cadets that year, Doubleday was ranked 24th. Doubleday saw action at Gettysburg and the Peninsula campaign. He fell into the displeasure of General Meade at Gettysburg.

Answer 2

Union General Issac Ferdinand Quinby graduated from West Point in 1843. His graduating class numbered 39. Quinby was ranked sixth. Quinby saw early action at the First Battle of Bull Run and in early assaults on Vicksburg. He became ill in 1863 and resigned. He died shortly after.