Lacrosse in the United States side of the field at all times. They must also have three players (usually three attackmen) on their offensive side of the ball at all times. The remaining three players (usually midfielders or middies) are free to roam the field as they please during the game. There are ten players on the field at a time. Still each team is allowed a maximum of seven players on their half of the field at a team and six players on their opponents’ side of the field at a time with the goalie being the extra man. Like hockey, substitutions are considered
Box lacrosse (Senior B national championship) the Founders Cup (Junior B national championship) all under box lacrosse rules. Briefly in 1939, a professional box lacrosse league started up in California, called the "Pacific Coast Lacrosse Association". This four team league also folded shortly after opening. Professional box lacrosse did not return to the United States again until 1968 when the Portland Adanacs and Detroit Olympics franchises played in the National Lacrosse Association, a circuit that folded after one summer season. A new professional indoor lacrosse league was created in the 1970s with the formation of the original National Lacrosse League. This league