He led his brigade at the Second Battle of Ream's Station, August 25, 1864, the Battle of Fair Oaks &amp; Darbytown Road, October 27–28, 1864 and the Battle of Five Forks, April 1, 1865, during the Siege of Petersburg. Spear was wounded at the Battle of Five Forks and resigned from the volunteers on May 9, 1865.