Statistics for occurrence #1 of “Colonel Dahlgren” in chapter 10 of William Swinton, Campaigns of the Army of the Potomac:

...rps and Custer's cavalry had made a demonstration on Lee's left. Crossing the Rapidan at Ely's Ford, beyond the Confederate right flank, the force marched thence to Spottsylvania Courthouse. Here Colonel Dahlgren , with five hundred picked men, assuming the most daring part of the expedition, diverged from the main body and pushed forward by way of Frederickshall towards the James River. The column under Gen...
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