Statistics for occurrence #1 of “Mr. Lincoln” in chapter 5.35 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 4.:

...utenant-general, the highest rank then known in the United States, and the same that was conferred on Washington in 1798. He reached the capital on the 7th, had an interview for the first time with Mr. Lincoln , and on the 9th received his commission at the hands of the President, who made a short address, to which Grant made a suitable reply. He was informed that it was desirable that he should come east...
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