 His assembled forces of 11,000 men were a bit short of the 15,000 he desired to conduct the operation, but he proceeded on the expedition anyway.Opposing Jackson were Banks's V Corps in Frederick, Maryland, which was patrolling and guarding the Potomac River from Harpers Ferry to Williamsport, Maryland.Additionally, Rosecrans had 5,000 men under Brigadier General Benjamin F. Kelley posted at Romney.