As disaster was befalling Shelby and Fagan, a similar fate was happening to Price's rearguard, under Marmaduke, at Byram's Ford. A division of Price's army under General Shelby had forced a crossing at the ford on the 22nd (the day prior to the battle), forcing Federal defenders there to retire to Westport. Shelby's colleague General Marmaduke had subsequently established his own defensive line on the west bank of the river to hold off Pleasanton's cavalry, which was pressing them hard from the east. If Pleasanton could now force "his" way across the Blue River, he would be in position to threaten Price's army as well as his supplies.