Statistics for occurrence #1 of “Fort Richardson” in chapter 35, regiment PA122 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

...Command, Defenses of Washington, to September, 1862. Piatt's 1st Brigade, Whipple's 3rd Division, 3rd Army Corps, Army of the Potomac, to May, 1863. Duty in the Defenses of Washington at Fort Richardson , Cloud's Mills, near Georgetown, and at Fairfax Court House till October. Moved to Point of Rocks, Md., thence to Pleasant Valley October 11-19. Movement toward Warrenton, Va., October 24-Nov...
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Fort Richardson (Alaska, United States) 0 0 0 0 0 user votes

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