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(183o-1882), graduated at West Point in 1850. In the Civil War he was continuously in the Army of the Potomac. He was a colonel at Big Bethel, commanded a brigade in the Peninsula campaign, Second Bull Run, Antietam and Fredericksburg, was chief engineer of the army at Chancellorsville and Gettysburg; in the latter struggle he seized the important position of Little Round Top. He was distinguished as commander of a corps at Centreville, October, 1863, and led a corps through the Wilderness, North Anna, Cold Harbor and Petersburg campaign, until at the battle of Five Forks, April 1,1865, he was removed by Sheridan. In 1879 he reached the grade of lieutenant-colonel in the regular army.