A Vacaville man was assaulted and robbed outside a Wal-Mart store in Fairfield Monday night, police said.The 38-year-old victim was getting out of his truck in the parking lot of the store, located at 300 Chadbourne Road, about 8:40 p.m. when a woman appeared and sprayed him with pepper spray, Sgt. Dan Pilcher said.Two men then hit him in the face and head with a pipe or gun and demanded money, Pilcher said. The victim complied and the suspects ran off.The victim suffered cuts and bruises to his face and head, and drove to NorthBay Medical Center for treatment, Pilcher said.The female suspect is described as white, 5 feet 2 inches tall and 140 pounds, police said. One of the two male suspects is described as black, 6 feet 4 inches tall and 240 pounds. He was wearing a black hoodie, Pilcher said. Anyone with information on the crime is asked to call police at (707) 428-7300.