From Jackson.
It was currently reported in town yesterday that Jackson had crossed the Potomac and was now in Williamsport, Maryland. Although we could not learn that official dispatches had been received to that effect, still the information was very generally believed and we deem it more probable than otherwise. Williamsport is on the river above Harper's Ferry, six miles from Hagerstown and on the Fredericktown turnpike. This rapid advance of Jackson has caused great consternation in Washington and is said to have made the diversion in McClellan's plans spoken or else where. We hope to be able to chronicle Jackson's entrance into Fredericktown, in which place he will meet with powerful additions to his army.We are told that seventy thousand Marylands stand ready at a moment's warning to join the standard or the old hero. Many of these men have arms hidden, and those who have none are ready to fight with thes, sticks or brickbats. It must be a happy thought that deliverance is so nigh. The fact that Jackson is the first man to lead an army into Maryland will stamp him as the here of the war, and will win for him the resting gratitude of a people who have long suffered from tyrannous rule.
