Below is a notice placed in the Richmond Daily Dispatch on November 5, 1863. It is interesting to note that the runaway was dressed in a Confederate cap and jacket. I think it was common for slaves who worked in the army to wear such clothing, which gave the mistaken impression that they were soldiers. I checked Booth's Record and could not find an Isaiah White in the 14th Louisiana.

"November 5, 1863 One hundred dollars reward
--Will be paid for the arrest and delivery of a negro boy named Joe. He is about 18 years old; black, with full, bushy hair, and about 5 feet7 inches high; had on when he left a gray military jacket and cap and blue twilled jeans pants and gum overcoat. He disappeared on Sunday, the 17th inst, during the recrossing of the army near the railroad bridge on the Rappahannock. He was last seen on this side of the river, near Brandy Station, and is believed to be either with the army or making his way to Liberty, Va. The above reward will be paid for his confinement or delivery to Samuel C White, at Liberty, Bedford county, Va, or Isaiah H White, Surgeon 14th Louisiana." regiment