...e these operations were going on, McCausland had occupied Hagerstown, and levied a contribution of $20,000, and Boonsboro had been occupied by Johnson's cavalry. On the 6th I received a letter from General Lee , by special courier, informing me that, on the 12th, an effort would be made to release the prisoners at Point Lookout, and directing me to take steps to unite them with my command, if the attempt wa...