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
Box lacrosse use a lacrosse stick to catch, carry, and pass the ball in an effort to score by shooting a solid rubber lacrosse ball into the opponent's goal. The highest levels of box lacrosse are the National Lacrosse League (NLL) (professional), Box Lacrosse League (semi-pro), Senior A divisions of the Canadian Lacrosse Association (semi-pro), the Western Lacrosse Association (semi-pro), and Major Series Lacrosse (semi-pro). While there are 59 total members of the Federation of International Lacrosse (FIL), only fifteen have competed in international box lacrosse competition. Only Canada, the Iroquois Nationals and the United States have finished in the top three