During a meeting held on 12 June 1906 at the George Hotel, Huddersfield, the members of the Northern Union agreed to adopt two rule changes that would distinguish the sport thereafter.

[1] The Northern Union, motivated by the need to appeal to spectators to improve the game's finances and ensure its survival, and inspired by the attacking style of rugby displayed by the New Zealand rugby union team during their 1905 tour of Britain, revisited two areas of the game that were the focus of much debate: the optimum number of players per team and how play should continue once a tackle had been completed.

Liverpool City joined, but Brighouse Rangers, Castleford, Millom, Morecambe, and Normanton withdrew, reducing the competition to 27 teams.

A decision by the Park Avenue Directors to form a professional association football (soccer) club forced Bradford rugby club to reform and relocate at Greenfield Stadium later adding "Northern" to their name.

Play-offs Warrington beat Oldham 17-3 in the final at Wheater's Field, Broughton, Salford before a crowd of 18,500 to win their second Cup in three seasons.