Statistics for occurrence #1 of “General Halleck” in chapter 1.7 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 7: Prisons and Hospitals.:

...upplies to the prisoners confined in various parts of the Confederacy. The resumption of the exchange of prisoners, however, soon made further action of this sort unnecessary. Since the action of General Halleck , May 25, 1863, regarding exchange of prisoners was based to a considerable extent on the attitude of the Confederate Government toward the negro troops and their white officers, it may be worth while...
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