Check out the account of Ten Islands in David Evans, Sherman's Horsemen. Aside from being badly outnumbered, Clanton's men seem to have been armed with smoothbore weapons which lacked the range and accuracy of the Spencers employed by Rousseau's men. Plus, all of Rousseau's regiments had considerable experience. Of course Clanton's men had not been in action before. Clanton was fortunate to have escaped with his command intact.