. The photographic history of the Civil War : thousands of scenes photographed 1861-65, with text by many special authorities . A CHANGE OF BASE—THE CAVALRY SCREEN Tliis jiliotograph of May 30, 18C4, shows tlie Federal cavalry in actual operation of a most important func-tion—tlie screening of the armys movements. The troopers are guarding the evacuation of Port Royalon the Ra])pahannock, May 30, 1864. After the reverse to the Union arms at Spottsylvania, Grant or-dered the change of base from the Rapi)ahannock to McClellans former starting-point, White House onthe Pamunkey. The control of the


. The photographic history of the Civil War : thousands of scenes photographed 1861-65, with text by many special authorities . A CHANGE OF BASE—THE CAVALRY SCREEN Tliis jiliotograph of May 30, 18C4, shows tlie Federal cavalry in actual operation of a most important func-tion—tlie screening of the armys movements. The troopers are guarding the evacuation of Port Royalon the Ra])pahannock, May 30, 1864. After the reverse to the Union arms at Spottsylvania, Grant or-dered the change of base from the Rapi)ahannock to McClellans former starting-point, White House onthe Pamunkey. The control of the waterways, combined with Sheridans efficient use of the cavalry, madethis an easy matter. Torberts division encountered Gordons brigade of Confederate cavalry at Hanover-town and drove it in the direction of Hanover Court House. Greggs division moved up to this line; Rus-sells division of infantry encamped near the river-crossing in support, and behind the mask thus formedthe Army of the Potomac crossed the Pamunkey on May 28tli unimpeded. Gregg was then ordered to recon-noiter towards Mechanicsville, and after a sev


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Keywords: ., bookauthormillerfrancistrevelya, bookcentury1900, bookdecade1910