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 yet to lose an international game in box lacrosse. Other international tournaments have been played. Annually, the European Lacrosse Federation holds the Aleš Hřebeský Memorial tournament in Prague. This is the largest European box lacrosse tournament. In 2002 and 2004, the Heritage Cup was played between the United States and Canada featuring mostly players that were members of NLL teams. Historically, box lacrosse has been exclusively a men's sport. Women who played the sport of lacrosse typically played the women's field lacrosse version. Recently, Ontario, Alberta, Nova Scotia and British Columbia have established girls' and women's box lacrosse leagues. During