The incident happened Saturday night in Culpeper, when police were called about a man who had charged them on horseback outside a convenience store after they asked him to stop urinating against the wall.
The man and a female companion, riding another horse then fled and the witnesses pointed police to a nearby subdivision, the Fredericksburg (Va.) Freelance Star reported Tuesday.
Seeing the officer, the male rider galloped off, made a sudden right turn, struck a mailbox and then was snapped out of the saddle when the horse passed under a guy wire, police said.
The woman surrendered and the man was taken to a hospital for stitches, the report said.
Eric Kyff, 39, and Lauren Allen, 27, were charged with riding a horse on a highway after dark without proper reflective material, being drunk in public and obstruction of justice.
The pair had previously been arrested for public drunkenness on horseback on May 24, police said.