In 1952, Charles S. Roberts created the first board wargame for the mass market, "Tactics", from his house in the Avalon neighborhood of Catonsville, Maryland. In 1954, he began selling it via mail-order as The Avalon Game Company; and Roberts formed gaming company Avalon Hill in 1958 to publish "Tactics II" (1958), the newest incarnation. "Tactics II" improved on the basic game design of his earlier effort, and formed the genesis for the concept of the combat results table. In 1958 he published "Gettysburg", considered to be the first board wargame based upon an actual historical battle, with subsequent versions in 1961 and 1964.