A Goggle Search, "Falling Waters." will lead you to this site. From there, you can get a good description of the second engagement.

George Martin

Falling Waters, West Virginia

From Wikipedia, the free encyclopedia

Falling Waters is an unincorporated town on the Potomac River in Berkeley County, West Virginia. It is located along Williamsport Pike (US 11) north of Martinsburg. According to the 2000 census, Falling Waters has a population of 7,043 [1].

The community of Falling Waters was established in 1815. Because of its location between Hagerstown and Martinsburg on the Potomac River, Falling Waters is a predominantly residential community with numerous historic residences, some of which are listed on the National Register of Historic Places.

Falling Waters was the site of two battles during the American Civil War:

The Skirmish of Falling Waters — July 1861
The Battle of Williamsport — July 1863 during the Gettysburg Campaign

In the latter engagement on the Maryland side of the river, Confederate
general J. Johnston Pettigrew, a key leader of Pickett's Charge, was mortally wounded by Union cavalry under George Armstrong Custer. However, his men helped delay the Union forces long enough for the bulk of the Army of Northern Virginia to escape into West Virginia and then on to Virginia following its defeat at the Battle of Gettysburg.