How large a number?
I know several CSA agents were hanged in New York city for planning to start massive fires.
I know about Sam Davis being hanged. He was operating as an agent around Nashville. You can see his boots at the Tennessee State Museum.
I know that the main CSA leaders were in the hands of the government -- Davis, Lee, Stephens, others. They were all released.
The loyal Texans were innocent as new borns when compared to the secessionists arrested in Maryland in 1861 for various acts.
Walt
I don't have a number for you. Maybe someone has tabulated it somewhere. It is just that I keep seeing reports in old newspapers of individual captured Confederates killed as spies and/or guerrillas when they were simply at home on leave. Maybe they were spies or guerrillas; maybe not.
The old newspapers are fascinating. For example, they report exchanged Confederate prisoners throwing their food rations back at their Federal captors as they were released.
Some Southern newspapers gave a very rosy picture of the Southern situation in the months before the war ended (e.g., Sherman is "retreating" through Georgia and "Why the South is as far from being subjugated as when the first gun of the war was fired." (December 1864))
They also contain some droll humor. At the risk of getting off subject, I'll include a little of it below in the exact words of the newspaper -- most of these snippets are from court reports.
"There was an 'ole nigger,' whose name was Paul, who made an affidavit that a colored soldier named Sterns had stolen his watch. It occurred in a doctor's shop. The negro Paul had a watch. The soldier Sterns went out of said shop, and the watch went out about the same time. Sterns sleeps tonight in the calaboose. He will be tried in due course."
"The Richmond Whig, of the 17th, says that all it could learn, upon inquiry at the War Department, was that Sherman was somewhere, but it was not known where."
"There is a colored boy Napoleon who is slightly affected by the crime of larceny. It indeed was a fowl affair. He stole seven chickens from a yard and sold four to a colored barber. His case was continued."
"Mary Welch is an Irish woman. Her trials are great. She concluded to alieviate them with potations of whiskey."
"There were two mules, Pete mule and Fanny mule; the latter was inclined to rove, on which Jeff concluded he would do Simon a favor by taking the stray mule home and go in search of the other. Unfortunately, however, he did not bring the mule back, nor has said mule ever been heard of since."
"A few days ago a drummer of the 7th Wisconsin was sent home from Chicago to her ma, because it was discovered that she was not so masculine as the regulations required."