Statistics for occurrence #1 of “Mr. Lincoln” in chapter 7 of Edward L. Pierce, Memoir and letters of Charles Sumner: volume 4:

... opera—at the same time promising to send him her copy of Louis Napoleon's Caesar, just received from Paris. She reached Washington from the headquarters on Sunday, April 2, leaving, however, Mr. Lincoln behind, and as soon as she arrived invited Sumner to join her on her return to City Point. The next morning she sent him from the Executive Mansion the tidings of the evacuation of Richmond, just r...
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