From his command post near Halltown, "Stonewall" Jackson methodically and deliberately positioned his cannons "to drive the enemy" into extinction. Indeed, Confederate artillery fire upon Harpers Ferry was effective and demoralizing. Colonel William H. Trimble of the 60th Ohio wrote that there was "not a place where you could lay the palm of your hand and say it was safe." Realizing that artillery alone probably would not subdue the Union garrison, Jackson ordered General A.P. Hill to flank the Federal position on top of Bolivar Heights. Using School House Ridge for cover, Hill moved his forces toward the Shenandoah River, dragged and tugged five batteries up the river's steep bluffs, and succeeded in planting his artillery 1,000 yards from the exposed left flank of the Union position. Hill later wrote that "the fate of Harpers Ferry was sealed." Louis Hull of the 60th Ohio agreed, writing in his diary on the evening of September 14th: "All seem to think that we will have to surrender or be cut to pieces."