On the way back to the courthouse square, Prentiss got away from them in the darkness, but Mosby kept a tight hold on Stoughton's bridle. By this time, the suspicion that all was not well in the county seat had begun to filter about. Men were beginning to turn out under arms all over town, and there was a confusion of challenges and replies and some occasional firing as hastily wakened soldiers mistook one another for the enemy. Mosby got his prisoners and horses together and started out of town as quickly as he could.
The withdrawal was made over much the same route as the approach, without serious incident. Thanks to the precaution of cutting the telegraph wires, the camp at Centreville knew nothing of what had happened at Fairfax Courthouse until long after the raiders were safely away. They lost all but thirty of the prisoners—in the woods outside Fairfax Courthouse, they escaped in droves—but they brought Stoughton and the two captains out safely.
The results were everything Mosby had hoped. He became a Confederate hero over night, and there was no longer any danger of his being recalled. There were several half-hearted attempts to kick him upstairs—an offer of a commission in the now defunct Virginia Provisional Army, which he rejected scornfully, and a similar offer in the regular Confederate States Army, which he politely declined because it would deprive his men of their right to booty under the Scott Law. Finally he was given a majority in the Confederate States Army, with authorization to organize a partisan battalion under the Scott Law. This he accepted, becoming Major Mosby of the Forty-Third Virginia Partisan Ranger Battalion.
The effect upon the enemy was no less satisfactory. When full particulars of the Fairfax raid reached Washington, Wyndham vanished from the picture, being assigned to other duties where less depended upon him. There was a whole epidemic of courts-martial and inquiries, some of which were still smouldering when the war ended. And Stoughton, the principal victim, found scant sympathy. President Lincoln, when told that the rebels had raided Fairfax to the tune of one general, two captains, thirty men and fifty-eight horses, remarked that he could make all the generals he wanted, but that he was sorry to lose the horses, as he couldn't make horses. As yet, there was no visible re-enforcement of the cavalry in Fairfax County from the front, but the line of picket posts was noticeably shortened.
About two weeks later, with forty men, Mosby raided a post at Herndon Station, bringing off a major, a captain, two lieutenants and twenty-one men, with a horse apiece. A week later, with fifty-odd men, he cut up about three times his strength of Union cavalry at Chantilly. Having surprised a small party, he had driven them into a much larger force, and the hunted had turned to hunt the hunters. Fighting a delaying action with a few men while the bulk of his force fell back on an old roadblock of felled trees dating from the second Manassas campaign, he held off the enemy until he was sure his ambuscade was set, then, by feigning headlong flight, led them into a trap and chased the survivors for five or six miles. Wyndham and Stoughton had found Mosby an annoying nuisance; their successors were finding him a serious menace.
This attitude was not confined to the local level, but extended all the way to the top echelons. The word passed down, "Get Mosby!" and it was understood that the officer responsible for his elimination would find his military career made for him. One of the Union officers who saw visions of rapid advancement over the wreckage of Mosby's Rangers was a captain of the First Vermont, Josiah Flint by name. He was soon to have a chance at it.
On March 31, Mosby's Rangers met at Middleburg and moved across the mountain to Chantilly, expecting to take a strong outpost which had been located there. On arriving, they found the campsite deserted. The post had been pulled back closer to Fairfax after the fight of four days before. Mosby decided to move up to the Potomac and attack a Union force on the other side of Dranesville—Captain Josiah Flint's Vermonters.
They passed the night at John Miskel's farm, near Chantilly. The following morning, April 1, at about daybreak, Mosby was wakened by one of his men who had been sleeping in the barn. This man, having gone outside, had observed a small party of Union troops on the Maryland side of the river who were making semaphore signals to somebody on the Virginia side. Mosby ordered everybody to turn out as quickly as possible and went out to watch the signalmen with his field glasses. While he was watching, Dick Moran, a Mosby man who had billeted with friends down the road, arrived at a breakneck gallop from across the fields, shouting: "Mount your horses! The Yankees are coming!"
It appeared that he had been wakened, shortly before, by the noise of a column of cavalry on the road in front of the house where he had been sleeping, and had seen a strong force of Union cavalry on the march in the direction of Broad Run and the Miskel farm. Waiting until they had passed, he had gotten his horse and circled at a gallop through the woods, reaching the farm just ahead of them. It later developed that a woman of the neighborhood, whose head had been turned by the attentions of Union officers, had betrayed Mosby to Flint.