Maj. Gen. Daniel E. Sickles of the III Corps had deviated from his orders, moving his corps to a position that left undefended a significant terrain feature: Little Round Top. The chief engineer of the Army of the Potomac, Brig. Gen. Gouverneur K. Warren, recognized the tactical importance of the hill and urgently sought Union troops to occupy it before the Confederates could. A staff officer sent by Warren encountered Vincent's brigade nearby. Vincent, without consulting his superior officers, decided that his brigade was in the ideal position to defend Little Round Top, saying "I will take the responsibility to take my brigade there." Pvt. Oliver Willcox Norton, Vincent's brigade standard bearer and bugler, later wrote that he and Vincent made a reconnaissance of the Confederate forces as the brigade was moving into position, "While our line was forming on the hill at Gettysburg I came out with him in full view of the rebel lines. They opened two batteries on us instantly, firing at the colors. Colonel Vincent looked to see what was drawing the fire and yelled at me, "Down with the flag, Norton! Damn it, go behind the rocks with it.".