Maney's attack continued to the west, down the reverse slope of the Open Knob, through a cornfield, and across the Benton Road, after which was another steep ridge, occupied by the 2,200 men in the Union 28th Brigade of Col. John C. Starkweather (Rousseau's division), and twelve guns. Those guns made the Open Knob an untenable position. Starkweather had placed his 21st Wisconsin in the cornfield about the time that Maney was attacking Parsons' position. The inexperienced men of the 21st—some of whom had never fired their weapons before, the regiment having been formed less than a month earlier—could see little through the 10- to high cornstalks of the cornfield. They were surprised as the remnants of Terrill's brigade retreated through their position. As Terrill himself retreated, he shouted, "The Rebels are advancing in terrible force!" Terrill convinced the regimental adjutant to order yet another bayonet charge; 200 men advanced and were quickly smashed by the oncoming Confederates. While the Union men had to hold their fire to keep from shooting their retreating comrades, artillery fire from Starkweather's batteries caused numerous friendly fire casualties. The 21st managed to fire a volley into the Confederate ranks, but it was answered by a 1,400-musket volley that decimated the Union regiment, and the survivors fled toward the Benton Road.