Question: In what year did lacrosse players stop playing on large fields?
About the article "Lacrosse", section "Box Lacrosse".

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Box lacrosse is played by teams of six on a hockey rink where the ice has been removed or covered by artificial turf, or in an indoor soccer or lacrosse field.
The enclosed playing area is called a box, in contrast to the open playing field of the traditional game.
This version of the game was introduced in the 1930s to promote business for hockey arenas, and within several years had nearly supplanted field lacrosse in Canada.
Box lacrosse is played at the highest level by the "Senior A" divisions of the Canadian Lacrosse Association and the National Lacrosse League (NLL).
The National Lacrosse League employs some minor rule changes from the Canadien Lacrosse Association (CLA) rules.
Notably, the games are played during the winter.
The NLL games consist of four fifteen-minute quarters compared with three periods of twenty minutes each (similar to ice hockey) in CLA games (multiple 15-minute OT periods for tied games, until whoever scores first).
NLL players may use only sticks with hollow shafts, while CLA permits solid wooden sticks.
:The goals in box lacrosse are much smaller than field lacrosse, traditionally wide by tall in box, and wide by tall in the NLL.
Also, the goaltender wears much more protective padding, including a massive chest protector and armguard combination known as "uppers", large shin guards known as leg pads (both of which must follow strict measurement guidelines), and ice hockey-style masks or lacrosse helmets.
Also, at the professional level, box lacrosse goaltenders often use traditional wooden sticks outside of the NLL, which does not allow wooden sticks.
This makes Box Lacrosse faster and rougher than the traditional Field Lacrosse.
The style of the game is quick, accelerated by the close confines of the floor and a shot clock.
The shot clock requires the attacking team to take a shot on goal within 30 seconds of gaining possession of the ball.
In addition, players must advance the ball from their own defensive end to the offensive side of the floor within 10 seconds.
Box lacrosse is also a much more physical game.
Since cross checking is legal in box lacrosse, players wear rib pads in addition to the shoulder and elbow pads that field lacrosse players wear.
Box lacrosse players wear a different type of helmet as well, a hockey helmet with a box lacrosse cage.
For most penalties, the offending player is sent to the penalty box and his team has to play without him (thus lacking one player) for a short amount of time.
Most penalties last for two minutes, unless a five-minute major penalty has been assessed.
What separates box lacrosse (and ice hockey) from other sports is that at the top levels of professional and junior lacrosse, a five-minute major penalty is given and the players are not ejected for participating in a fight. 
Major League Lacrosse holds its draft in January each year and selects from collegiate players that are playing their final year of eligibility. 
Lacrosse is a traditional Indigenous people's game which was first encountered by Europeans when French Jesuit missionaries in the St. Lawrence Valley witnessed the game in the 1630s.
Lacrosse for centuries was seen a key element of cultural identity and spiritual healing to Native Americans.
It originated as a field game and was adopted first by Canadian, American, and English athletes as a field game, eventually settling on a 10 v 10 format.
Box lacrosse is a modern version of the game that was invented in Canada during the 1920s and 30s.
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 in unused hockey rinks.
Canadians adopted the new version of the sport quickly.
Eventually it became the more popular version of the sport in Canada, supplanting field lacrosse.
This form of was also adopted as the primary version of the game played on Native American reservations in the US and Canada by Iroquois and other Native peoples., It is the only sport in which the American indigenous people are sanctioned to compete internationally, participating as the Iroquois Nationals.
However, many field lacrosse enthusiasts viewed the new version of the sport with negativity.
The first professional box lacrosse games were held in 1931.
That summer the arena owners formed the "International Lacrosse League" featuring four teams: the Montreal Canadiens, Montreal Maroons, Toronto Maple Leafs, and Cornwall Colts.
The league only lasted two seasons.
In the wake of the original "International Lacrosse League" opened the "American Box Lacrosse League" featuring six teams: two in New York City, and one each in Brooklyn, Toronto, Boston, and Baltimore.
The league played to small crowds on outdoor fields such as Yankee Stadium and Fenway Park, before closing midway through its inaugural season.
Lacrosse was officially declared Canada's National Summer Sport with the passage of the "(Bill C-212)" on May 12, 1994.
Box lacrosse first appeared in Australia as early as 1930.
Newspaper articles at the time reported that the sport may have even been created in Australia, when two prominent Melbourne clubs played a six-a-side lacrosse match in a dance hall for charity.
By 1933, box lacrosse matches were being played in Adelaide, Brisbane, and Perth.
This new version of the game did not overtake the traditional version of lacrosse in popularity in Australia as happened in Canada.
The Canadian Lacrosse Association began sponsoring box lacrosse.
In 1932, the 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 (Senior B national championship) the Founders Cup (Junior B national championship) all under box lacrosse rules.
Briefly in 1939, a professional box lacrosse league started up in California, called the "Pacific Coast Lacrosse Association".
This four team league also folded shortly after opening.
Professional box lacrosse did not return to the United States again until 1968 when the Coquitlam Adanacs franchise played one Western Lacrosse Association season in Portland, Oregon.
A new professional indoor lacrosse league was created in the 1970s with the formation of the original National Lacrosse League.
This league opened in 1974 with teams in Montreal, Toronto, Rochester, Syracuse, Philadelphia, and Maryland.
For the 1975 season, Rochester moved to Boston, Syracuse moved to Quebec City, and Toronto moved to Long Island.
Thus, by its second year, the original NLL was playing in all major league arenas: The Quebec Colliseum, Montreal Forum, Boston Garden, Long Island Arena, Philadelphia Forum, and Capital Centre.
When the two wealthier '75 NLL franchises, Philadelphia and Maryland, finished out of the playoffs, and with Montreal losing access to the fabled Montreal Forum in the upcoming season due to the 1976 Montreal Olympic 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 second season, and in 1998 renamed itself again, this time to the NLL.
In 1998, the NLL entered into the Canadian market for the first time with the Ontario Raiders.
Although 6 of the league's 9 teams are based in American cities, more than two-thirds of the players are Canadian. 
In 1976, Woolley and John Dorflinger of North Delta, BC founded the North Delta Minor Lacrosse Association (NDML).
What initiated the move were the 40 registered lacrosse players residing in North Delta, British Columbia that were playing for Surrey minor teams.
Woolley set up a successful recruitment drive to promote lacrosse to children residing in his own community.
He also drafted up an association constitution and bylaws that complied with the "BC Societies Act".
During the same year, he became 2nd Vice President of the North Delta Minor Lacrosse Association. 
Casey Powell is a lacrosse player in the United States.
He was the captain of the US national team in the 2006 World Lacrosse Championship and also played on the 1998 US national team.
He currently plays indoor lacrosse in the National Lacrosse League for the Colorado Mammoth.
Powell plays the attack and midfield positions.
In 1998, he graduated from Syracuse University, where he was a four-time All American.
His two brothers Ryan and Mikey are also well known lacrosse players.
Powell started playing Major League Lacrosse in 2001, first with the Long Island Lizards until 2003 when he was traded to the Rochester Rattlers.
In 2005, he won the MLL Offensive Player of the Year award.
On August 16, 2013, North Broward Preparatory School announced that Casey Powell has been hired as Director of Lacrosse Programs for the school.
On December 3, 2013, Major League Lacrosse announced that Casey Powell was traded from the Chesapeake Bayhawks to the newly formed Florida Launch.