On Saturday, July 13th, General Scott telegraphed to Patterson: "I telegraphed to you yesterday, if not strong enough to beat the Enemy early next week, make demonstrations so as to detain him in the Valley of Winchester; but if he retreats in force toward Manassas, and it be too hazardous to follow him, then consider the route via Keys Ferry, Leesburg, etc."
On Wednesday, the 17th, Scott telegraphs to Patterson: "I have nothing official from you since Sunday (14th), but am glad to learn, through Philadelphia papers, that you have advanced. Do not let the Enemy amuse and delay you with a small force in front whilst he re-enforces the Junction with his main body. McDowell's first day's work has driven the Enemy beyond Fairfax Court House. The Junction will probably be carried by to-morrow."
On Thursday, the 18th, Patterson replies that to attack "the greatly superior force at Winchester "when the three months volunteers' time was about up, and they were threatening to leave him—would be "most hazardous" and then he asks: "Shall I attack?"
Scott answers the same day: "I have certainly been expecting you to beat the Enemy. If not, to hear that you had felt him strongly, or, at least, had occupied him by threats and demonstrations. You have been at least his equal, and, I suppose, superior in numbers. Has he not stolen a march and sent re-enforcements toward Manassas Junction? A week is enough to win victories," etc.
Patterson retorts, on the same day: "The Enemy has stolen no march upon me. I have kept him actively employed, and by threats, and reconnaissances in force, caused him to be re-enforced. I have accomplished in this respect more than the General-in-Chief asked, or could well be expected, in face of an Enemy far superior in numbers, with no line of communication to protect."
In another dispatch, to Assistant Adjutant-General Townsend (with General Scott), he says, that same afternoon of Thursday, the 18th: "I have succeeded, in accordance with the wishes of the General-in-Chief, in keeping General Johnston's Force at Winchester. A reconnaissance in force, on Tuesday, caused him to be largely re-enforced from Strasburg."
Again, on Friday, the 19th, he informs Colonel Townsend that: "The Enemy, from last information, are still at Winchester, and being re-enforced every night."
It is not until Saturday, the 20th of July, that he telegraphs to Townsend: "With a portion of his force, Johnston left Winchester, by the road to Millwood, on the afternoon of the 18th." And he adds the ridiculous statement: "His whole force was about 35,200."
Thus, despite all the anxious care of General Scott, to have Johnston's Army detained in the Shenandoah Valley, it has escaped Patterson so successfully, and entirely, that the latter does not even suspect its disappearance until the day before the pitched Battle of Bull Run is fought! Its main body has actually reached Manassas twenty-four hours before Patterson is aware that it has left Winchester!
And how is it, that Johnston gets away from Patterson so neatly? And when does he do it?