When the Confederacy went to pieces in April, 1865, Wirz was still at Andersonville.  General Wilson, commanding our cavalry forces, and who had established his headquarters at Macon, Ga., learned of this, and sent one of his staff—­Captain H. E. Noyes, of the Fourth Regular Cavalry —­with a squad. of men, to arrest him.  This was done on the 7th of May.  Wirz protested against his arrest, claiming that he was protected by the terms of Johnson’s surrender, and, addressed the following letter to General Wilson: 

Andersonville, Ga., May 7, 1865.

General:—­It is with great reluctance that I address you these lines, being fully aware how little time is left you to attend to such matters as I now have the honor to lay before you, and if I could see any other way to accomplish my object I would not intrude upon you.  I am a native of Switzerland, and was before the war a citizen of Louisiana, and by profession a physician.  Like hundreds and thousands of others, I was carried away by the maelstrom of excitement and joined the Southern army.  I was very severely wounded at the battle of “Seven Pines,” near Richmond, Va., and have nearly lost the use of my right arm.  Unfit for field duty, I was ordered to report to Brevet Major General John H. Winder, in charge of the Federal prisoners of war, who ordered me to take charge of a prison in Tuscaloosa, Ala.  My health failing me, I applied for a furlough and went to Europe, from whence I returned in February, 1864.  I was then ordered to report to the commandant of the military prison at Andersonville, Ga., who assigned me to the command of the interior of the prison.  The duties I had to perform were arduous and unpleasant, and I am satisfied that no man can or will justly blame me for things that happened here, and which were beyond my power to control.  I do not think that I ought to be held responsible for the shortness of rations, for the overcrowded state of the prison, (which was of itself a prolific source of fearful mortality), for the inadequate supply of clothing, want of shelter, etc., etc.  Still I now bear the odium, and men who were prisoners have seemed disposed to wreak their vengeance upon me for what they have suffered—­I, who was only the medium, or, I may better say, the tool in the hands of my superiors.  This is my condition.  I am a man with a family.  I lost all my property when the Federal army besieged Vicksburg.  I have no money at present to go to any place, and, even if I had, I know of no place where I can go.  My life is in danger, and I most respectfully ask of you help and relief.  If you will be so generous as to give me some sort of a safe conduct, or, what I should greatly prefer, a guard to protect myself and family against violence, I should be thankful to you, and you may rest assured that your protection will not be given to one who is unworthy of it.  My intention is to return with my family to Europe, as soon as I can make the arrangements.  In the meantime I have the honor General, to remain, very respectfully, your obedient servant,