President Andrew Johnson Impeached: The First Presidential Impeachment in American History by Tatiana Alentieva

“…The President was charged in connection with the dismissal of Secretary of War E. Stanton, which was a violation of the Tenure of Office Act. …”
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The royalist army in the first civil war by Roy, I

“…The papers of the secretary-at-war, Edward Walker, help us to see it at work. …”