The league added two new teams in Toronto, the Torontos and the Tecumsehs. Former Ottawa player Bruce Ridpath became Toronto's first manager. The new teams recruited their own players and no players moved from other NHA teams to Toronto. However, the PCHA went after NHA players and Ottawa's Cyclone Taylor and Dubby Kerr moved west to play in the PCHA. Taylor, who had been barred from joining the Senators by the Wanderers, became eligible to play for the Senators when the Wanderers dropped their interest in him, but he chose to move out west where he would remain for the rest of his life. Marty Walsh, who had become a part-time player in the 11–12 season, retired. Two new players joined the Senators lineup this season, Punch Broadbent and Clint Benedict, who would both play for Ottawa into the 1920s. Defenceman Horace Merrill, who had previously been a spare for the Senators, joined them full-time this season.
After the season a series was arranged between Ottawa and Montreal Wanderers and Quebec to play in New York. Ottawa and Montreal played first, with the winner to play-off against Quebec. After the Wanderers defeated Ottawa 10–8 (3–2, 7–6), the Wanderers won the two-game series against Quebec 12–10 (9–5, 3–5).