Joe, you have Mosby down pat. The following quote covers the question of executing prisoners: "The disruption of supply lines and the constant disappearance of couriers frustrated Union commanders to such a degree that Sheridan ordered the summary execution of captured partisan rangers. When Union Brig. Gen. George A. Custer executed some of Mosby's men in 1864 in Front Royal, Virginia, Mosby threatened retaliation by executing some of Custer's, but Mosby never carried through on that threat. Instead, he wrote a letter to General Ulysses S. Grant stating that he vehemently objected to such tactics, and pointing out that he had taken far more Union prisoners than they had ever taken of his men, and that he had scrupulously treated them as prisoners of war. By Grant's orders, there were no more executions.

After Robert E. Lee's surrender, Mosby disbanded his guerrillas, refusing to surrender formally. After the war, he worked in a series of government posts, including a position as a Republican campaign manager for President Grant, as U.S. consul to Hong Kong (1878–1885), and assistant Attorney General in the Department of Justice (1904–10). He died in Washington and is buried in Warrenton Cemetery."

http://en.allexperts.com/e/j/jo/john_s._mosby.htm

I included that second paragraph to contrast the attitude toward Mosby and Longstreet over their similar post war activities. I think it is interesting. Stan