Taken from "Oshawa" by M. McIntyre Hood.

LACROSSE
 Lacrosse is the sport with the longest history of all the Oshawa
sporting activities. It provided the first Oshawa team to take part
in any outside sports competition. That was in 1872, when lacrosse
enthusiasm was at its height. This team played against teams from
Port Hope, Bowmanville, Millbrook, and other Central Ontario
towns which were then just as large as Oshawa. This enthusiasm
lasted from 1870 to 1875; but thereafter interest waned and the
game died out for a period of 25 years.

 The revival of lacrosse started about the turn of the century when
a four-team league, composed of Williams Piano, Ontario Malleable
Iron, McLaughlin Carriage and a town team was oranized. The games 
in those days were played at Eli Edmondson's Prospect Park. In 1907,
a famous team, the Oshawa 'Shamrocks', which had in its lineup the 
legendary Newsy Lalonde, brought its first lacrosse fame to Oshawa.
Thereafter lacrosse continued, but not as a championship level, until
1921 when the Oshawa team lost in the Ontario intermediate final to
St.Marys.

 Lacrosse was given its greatest boost in 1928 when General Motors
of Canada sponsored a senior team. A great collection of lacrosse
stars was assembled, including players of the stature of Chuck Barron,
Chuck Davidson, Tilly Stokes, Buster Whitton, Ernie Shepley, Smokey
Fox, Bob Stevenson, Toots White, Mel Whyte, Mac McGrath, Ted Reeves,
Kelly DeGray, Red Spencer, Smitty Smithson, Jack and Pete Walsh and 
the goalie, Patty Shannon. Munro coached the seniors and Harry Lott
the juniors. In that year, Oshawa's intermediate team won the Ontario
championship.

 In 1929, the club has some added strength. Charles McTavish became
its president, and this was its greatest year. It won the Ontario
senior championship, and then went on to win the Dominion Championship
and the Mann Cup, besting on the way Ottawa, Winnipeg, Edmonton and the 
famous 'Salmon Bellies' of New Westminster. In June 1930, as Canadian
champions, the Oshawa team took part in the world championship 
tournament with a United States team, and won the world title by the 
margin 11 to 10 in a two-game series.

 In the 1930 season, Brampton 'Excelsiors' eliminated Oshawa from the
Ontario championship series. In 1931, when the depression was at its
worst, General Motors withdrew its support and the team was broken up.

 In 1932, box lacrosse was born, and it was played in the Oshawa Arena
in 1932 and 1933; but only with local teams.

....

 My own notes: Oshawa did come back to play one season of Senior A box
lacrosse in 1928, but unfortunetly could not win a game and thus vanished
from the scene till the Jim Bishop led Oshawa Green Gaels appeared on the
scene and won seven consecutive Canadian Minto Cups as Dominion Junior A
champs. "http://bible-of-lacrosse.com/newstats/1936seniora.txt".