Liddell's men fired at an unknown unit less than east of the crossroads. Calls were heard, "You are firing upon friends; for God's sake stop!" Leonidas Polk, the wing commander, decided to ride forward to see who had been the victims of the supposedly friendly fire. Polk found that he had ridden by mistake into the lines of the 22nd Indiana and was forced to bluff his way out by riding down the Union line pretending to be a Union officer and shouting at the Federal troops to cease fire. When he had escaped he shouted to Liddell and the Confederates fired hundreds of muskets in a single volley, which killed Col. Squire Keith and caused casualties of 65% in the 22nd Indiana, the highest percentage of any Federal regiment engaged at Perryville. Although Liddell wanted to pursue the assault, Polk had been unnerved by his personal contact with the enemy and halted the attack, blaming the falling darkness. The Union units moved their supplies and equipment through the endangered intersection and consolidated their lines on a chain of hills northwest. McCook's corps had been badly damaged during the day, but was not destroyed.