Hume’s major break occurred on November 3, 1883, when Bart robbed a Wells Fargo coach headed from the town of Sonora to Milton, in Calaveras County. One of the drivers fired a shot at Bart, and forced him to promptly flee. Within the nearby brush, local officers found a cache of rations and correctly assumed that the goods were the bandit's. More importantly however, a blood-stained handkerchief bearing the laundry mark "F.X.0.7" was recovered. Hume had previous engaged as a special detective Harry Morse, former sheriff of Alameda County, who now spent a week visiting every laundry in San Francisco – nearly a hundred of them, to track down where the mark originated. Eventually Morse inquired its origin at a laundry on Bush Street in San Francisco. The proprietor identified the F.X.0.7 handkerchief mark as that assigned to C.E. Bolton, a man who lived in a hotel on Second Street. The arrest of Black Bart was at hand. Morse got Bart to accompany him to Hume's office in the nearby Wells Fargo building, and after a thorough grilling, Bart eventually confessed and receive a term in San Quentin prison.