Statistics for occurrence #1 of “Washington, D. C.” in chapter 11 of William Boynton, Sherman's Historical Raid:

...er sending the above letter to General Banks, again wrote the outlines of his plans to General Sherman, as will be seen by the letters which follow: headquarters armies of the United States, Washington, D. C. , April 4, 1864. Major-General W. T. Sherman, Commanding Military Division of the Mississippi. General: It is my design, if the enemy keep quiet and allow me to take the initiative in the Spring ...
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