...at his plan was to send A. P. Hill to the right and rear of the enemy, and G. W. Smith to the left flank, with orders to make simultaneous attacks for the purpose of doubling up the army, and sending Longstreet to cross at Mechanicsville bridge and attack him in front. McClellan's line on his right was not then well fortified, and the general disposition of the Federal forces was more favorable for a Conf...