...emy massed in front of Pender's Brigade and endeavored to turn his left. General Pender became hotly engaged and informing Archer of his danger he (Archer) marched by the left flank, and forming on Pender 's left, a simultaneous, daring charge was made, and the enemy driven pell mell into the river. Then commenced the most terrible slaughter the war witnessed. The broad surface of the Potomac was b...