The Royal Navy's field gun competition is a contest between teams from various Royal Navy commands, in which teams of sailors compete to transport a field gun and its equipment over and through a series of obstacles in the shortest time. The competition evolved during the early years of the 20th century. The "Command" format, negotiating walls and a chasm, was held annually at the Royal Tournament in London from 1907 until 1999, apart from the periods during the World Wars. The "Inter-Port" or "Command" Competition was contested by teams from the Royal Navy annually, and was a popular item at the Royal Tournament until finishing in 1999.