Statistics for occurrence #1 of “Washington, D. C.” in chapter 4, page 37 of John D. Billings, The history of the Tenth Massachusetts battery of light artillery in the war of the rebellion:

...to a commodious barn-like building, known as the Soldiers' Rest, and throwing ourselves on the floor, were soon sound asleep. Oct. 14. Started from Boxford at 11.30 o'clock en route for Washington, D. C. , with orders to report to the Adjutant General. At Boston we took a special train in which there were 111 horses turned over to us by Capt. McKim. Oct. 17. Arrived in Washington and encamped ...
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