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 Games, the league folded after two seasons due to financial uncertainty. The rebirth of professional box lacrosse in the United States came on March 13, 1986, with the formation of the "Eagle Pro Box Lacrosse League", which was incorporated by Russ Cline and Chris Fritz. The league originated with four teams: the Philadelphia Wings, New Jersey Saints, Washington Wave, and Baltimore Thunder, and unlike box lacrosse generally, was played during the winter. The league rebranded itself as the "Major Indoor Lacrosse League" (MILL) immediately after its inaugural season, and in 1998 renamed itself again, this time to the NLL. In