The chase broke off, finally, when the pursuers halted to get their prisoners and captured horses together. Then they discovered that one of their number, a man named Cobb, had been killed. Putting the dead man across his saddle, they carried the body back to Piedmont, and the next day assembled there for the funeral. The services had not yet started, and Mosby was finishing writing a report to Stuart on the previous day's action, when a scout came pelting in to report Union cavalry in the vicinity of Middleburg. Leaving the funeral in the hands of the preacher and the civilian mourners, Mosby and the 150 men who had assembled mounted and started off. Sam Chapman, the ex-artillery captain, who had worked up from the ranks to a lieutenancy with Mosby, was left in charge of the main force, while Mosby and a small party galloped ahead to reconnoiter. The enemy, they discovered, were not Cole's men but a California battalion. They learned that this force had turned in the direction of Leesburg, and that they were accompanied by the deserter, Binns. Mosby made up his mind to ambush the Californians on their way back to their camp at Vienna. He had plans, involving a length of rope, for his former trooper, Binns. The next morning, having crossed Bull Run Mountain the night before, he took up a position near Dranesville, with scouts out to the west. When the enemy were finally reported approaching, he was ready for them. Twenty of his 150, with carbines and rifles, were dismounted and placed in the center, under Lieutenant Mountjoy. The rest of the force was divided into two equal sections, under Chapman and Frank Williams, and kept mounted on the flanks. Mosby himself took his place with Williams on the right. While they waited, they could hear the faint boom of cannon from Washington, firing salutes in honor of Washington's Birthday. A couple of men, posted in advance, acted as decoys, and the Union cavalry, returning empty-handed from their raid, started after them in hopes of bringing home at least something to show for their efforts. Before they knew it, they were within range of Mountjoy's concealed riflemen. While they were still in disorder from the surprise volley, the two mounted sections swept in on them in a blaze of revolver fire, and they broke and fled. There was a nasty jam in a section of fenced road, with mounted Mosby men in the woods on either side and Mountjoy's rifles behind them. Before they could get clear of this, they lost fifteen killed, fifteen more wounded, and over seventy prisoners, and the victorious Mosby men brought home over a hundred captured horses and large quantities of arms and ammunition. To their deep regret, however, Binns was not to be found either among the casualties or the prisoners. As soon as he had seen how the fight was going, the deserter had spurred off northward, never to appear in Virginia again. Mosby's own loss had been one man killed and four wounded.