The 1917–18 NHL season was the first season of the National Hockey League (NHL) professional ice hockey league. The league was formed after the suspension of the National Hockey Association (NHA). Play was held in two halves, December 19 to February 4, and February 6 to March 6. The Canadiens won the first half, and Toronto the second half. The Montreal Wanderers withdrew early in January 1918 after their rink, the Westmount Arena, burned down. Toronto won the NHL playoff and then won the Stanley Cup by defeating the PCHA's Vancouver Millionaires three games to two in a best-of-five series. Taken from https://en.wikipedia.org/wiki/1917%E2%80%9318_NHL_season

Final Stats:

League Standings
1st Half	GP	W	L	T	PTS	2nd Half	GP	W	L	T	PTS
Montreal Canadiens	14	10	4	0	20	Toronto Arenas	8	5	3	0	10
Toronto Arenas	14	8	6	0	16	Ottawa Senators	8	4	4	0	8
Ottawa Senators	14	5	9	0	10	Montreal Canadiens	8	3	5	0	6
Montreal Wanderers	6	1	5	0	2
League Playoff Series
NHL Final	Total goals: 10-7	Toronto Arenas tied with Montreal Canadiens