Statistics for occurrence #1 of “W. W. Belknap” in entry impeachment of Harper's Encyclopedia of United States History:
...dge of Tennessee, impeached and convicted for rebellion, Jan. 26, 1862.
(6) Andrew Johnson, President of the United States, impeached of high crimes and misdemeanors, Feb. 22, 1868; acquitted. (7) W. W. Belknap , Secretary of War, impeached for receiving money of posttraders among the Indians, March 2, 1876; resigned at the same time; acquitted for want of jurisdiction.
...