Miss W By MissWestervelt Dec 5, 1839 When was Custer born? Custer was born on December 5, 1839. Period: Dec 24, 1861 to Dec 25, 1862 When did he fight in the Civil War He fought in the Civil War from 1861-1862 Dec 24, 1863 What battles did he fight? Grant fought in the Battle of Gettysburg. Dec 24, 1978 fggfg shfghd Dec 24, 1978 When did he die? He died on December 24, 1778.