During WWI many rugby players were taken to Europe ny their army to fight the war.
At the end of the war, with the armies still in Europe, sport, and rugby, restarted again with its activities.
In 1919 RFU, leader in world rugby at that time, organized a tournament dedicated to british empire armies, called King's Cup.
The invited teams were:
Due to the very high technical level of the teams, this tournament is sometimes referred as the first unofficial world cup.
In the same period, the French were organizing the Inter-Allied Games, a multi sport event very similar to the Olympics, but open only to WWI winner nations.
The rugby tournament was played by: