Statistics for occurrence #1 of “Vice-President Andrew Johnson” in chapter 1.30 of Jefferson Davis, The Rise and Fall of the Confederate Government:

...tt, Michael O'Loughlin, Samuel Arnold, George A. Atzerott, Samuel A. Mudd, and Mary E. Surratt, did on April 15, 1865, combine, confederate, and conspire together to murder President Abraham Lincoln, Vice-President Andrew Johnson , Lieutenant-General U. S. Grant, and Secretary of State William H. Seward. President Lincoln had been shot, and Secretary Seward was badly wounded with a knife. The others were uninjured. ...
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