Box lacrosse The roots of indoor lacrosse are obscure, but its invention has been attributed to one Paddy Brennan, a field lacrosse player and referee from Montreal, who, being annoyed by the constant slowing of play from balls going out of bounds in the field game, experimented with indoor games at the Mount Royal Arena during the early 1920s. Joseph Cattarinich and Leo Dandurand, owners of the National Hockey League's Montreal Canadiens in the 1920s, led the participating ice hockey arena owners to introduce the new sport. In the 1930s, 6 v 6 indoor lacrosse came to be played in the summer
Field lacrosse ten players on the field: a goalkeeper; three defenders in the defensive end; three midfielders free to roam the whole field; and three attackers attempting to score goals in the offensive end. Players are required to wear some protective equipment, and must carry a lacrosse stick (or crosse) that meets specifications. Rules dictate the length of the game, boundaries, and allowable activity. Penalties are assessed by officials for any transgression of the rules. The game has undergone significant changes since Beers' original codification. In the 1930s, the number of players on the field per team was reduced from twelve to