A federal agency has ordered a Culpeper County man to stop building a pond on his property that has dammed a creek and affected part of the Brandy Station battlefield.

The U.S. Army Corps of Engineers, via a letter sent Friday, instructed Tony Troilo to "cease and desist" bulldozing along Flat Run, a perennial tributary of Mountain Run, which feeds the Rappahannock River.

Nicholas L. Konchuba, chief of the corps' Northern Virginia Regulatory Section, advised Troilo that the earth-moving on his 60 acres off State Route 685 near Brandy Station directly violates the federal Clean Water Act.