Statistics for occurrence #1 of “General Grant” in chapter 2, page 26 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 8: Soldier Life and Secret Service.:
...hey donned, as they had to, the Confederate uniform and penetrated the Confederate lines.
There, if suspected and arrested, their fate was sealed.
Yet it was one of these who successfully bore to General Grant , Sheridan's urgent I wish you were here, when, on the 5th of April, 1865, the latter saw slipping away the chance of penning Lee's harassed and panting army
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