General George Sykes CDV and War Date Signature. At the Battle of Gettysburg, Sykes' corps fought in support of the beleaguered III Corps on the Union left flank. In his 1st Division the fabled defense of Little Round Top was led by brigade commander Col. Strong Vincent and the 20th Maine Infantry under Col. Joshua Lawrence Chamberlain. His 3rd Division, the Pennsylvania Reserves, led by Brig. Gen. Samuel W. Crawford, attacked from Little Round Top, drove the Confederates across the "Valley of Death" and ended the deadly fighting in the Wheatfield.