Near Kansas City, Union troops clashed with Price's army in a series of battles: October 19 in Lexington, October 21 at the Little Blue River, October 22 at the Big Blue River, and October 23 in Westport. The Battle of Westport was a stunning Confederate defeat, and Price withdrew south with Union cavalry in close pursuit. Early on the morning of October 25, a running skirmish developed over the nine miles between Trading Post and Mine Creek. When the Confederate rear guard arrived at the banks of Mine Creek, the end of the supply train had not yet crossed and several wagons were congested at the crossings. With 2,500 Union troops only 500 yards behind, the 7,000 Confederates were forced to stop and fight, resulting in one of the largest cavalry battles in the Civil War and a major Confederate defeat in the west.