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 Mann Cup, the most prestigious lacrosse trophy in Canada, was contended for under box lacrosse rules for the first time. Previously, the national senior men's lacrosse championship, awarded since 1901, was competed for under field lacrosse rules. The Mann Cup is an annual tournament that presents the champion of the Western Lacrosse Association and Major Series Lacrosse in a best of seven national championship. A few years later, in 1937, the Minto Cup, began being awarded under box lacrosse rules to the junior men's champions. Currently the Canadian Lacrosse Association oversees the Mann Cup, the Minto Cup, the Presidents Cup