1931: Ottawa Rangers 24, Quebec "Swimmers" 07

The Ottawa Rangers, nicknamed "blue shirts" on occasion, were not around very long but they may have left a very specific mark on football in the region.

They began play on 1930, officially, in the Quebec Rugby Football Union, posting a 3-3 record. Under Leo Gleeson the following year, they won four contests, lost two, and reached the semi-finals. 

That semi-final game turned into an exhibition of the forward pass. It was not the first instance of the forward pass being put in use, that took place in 1929, according to the CFL website:

1929
CRU adopted use of the forward pass on a limited basis in Junior, Interscholastic, Western Canada Rugby Union, Western Intercollegiate Union and the Grey Cup final. First legal pass in Canada was thrown by Gerry Seiberling and the first reception was by Ralph Losie of Calgary Altomah-Tigers against Edmonton on September 21... 

1931
CRU approved the forward pass for all leagues and the first TD pass in Grey Cup history was a Warren Stevens to Kenny Grant play in Montreal's 22-0 win over Regina. Convert scrimmage line was moved to the five-yard line, and the point could be scored by a drop-kick, place kick, run or pass.

...but the semi-final game summary certainly makes it sound like its first heavy usage in a game and perhaps the game in which it became better accepted as an exciting feature.

The Rangers scored another unconverted touchdown in a drive that began at their own 40 to take a 12-00 lead. Arnie Morrison punched that one in, he of the "lifetime ban" for his involvement in a brawl in 1929 following a game against the St. Thomas Tigers while he was a member of the Rideaus. 

The final Rangers touchdown came off an interception return by Clair Forster.

Now this makes me want to track down the first recorded forward pass by an Ottawa team. If if wasn't in this game (and I doubt it was) it had to have taken place no more than weeks prior to this game being played. Let's see what we find.