4th Canadian Division, Army in Ontario


“Prepared in peace and war”

Resources @ Hand 

Who We Are

The 4th Canadian Division (4 Cdn Div) is one of the six major formations that report to Army headquarters in Ottawa. 4 Cdn Div is responsible to provide combat ready land forces in accordance with assigned tasks, conduct general purpose training in preparation for various land operations, and provide support services to other organizations as directed or as mutually arranged. It includes all Regular and Reserve Force units in Ontario, with the exception of a portion of North Western Ontario, which falls under 3rd Canadian Division (3 Cdn Div).

Our Mission

The mission of 4 Cdn Div is to generate and maintain, at designated states of readiness, combat ready, multi-purpose land forces to meet Canada’s defence objectives, both at home and abroad. Members of 4 Cdn Div take part in continuous, challenging, individual and collective training to prepare them to achieve this mission.

Formations and Units

4 Cdn Div is spread across 46 Ontario communities and comprises more than 13,000 men and women, including

  • 5,880 Regular Force members
  • 5,980 Reserve Force members
  • 620 Canadian Rangers
  • 1,140 civilian employees

Browse all Ontario units and formations by location.

The Regular Force units (with members working full-time) are most commonly found on bases and sites across the province. The two largest concentrations are the 4th Canadian Division Support Base Petawawa in the Ottawa Valley and Canadian Forces Base (CFB) Kingston on the north shore of Lake Ontario.

The 4 Cdn Div Headquarters is found at the Denison Armoury on the grounds of Downsview Park in north Toronto.

Command Team

Commander, 4th Canadian Division

Commander: Brigadier-General S.M. Cadden, CD

Sergeant Major, 4th Candian Division

Sergeant Major: Chief Warrant Officer Stuart Hartnell MMM, MSM, CD

Contact Us

4th Canadian Division Headquarters
The LCol George Taylor Denison III Armoury
1 Yukon Lane Toronto
Ontario, M3K 0A1

Phone: Switchboard: 416-633-6200 (Operator 0)

Media inquiries

Phone: 416-633-6200 ext. 5505

You can also contact a public affairs representative with a specific formation or unit.

Media Liaison Office: 1-800-377-0811

Hours of Operations: Monday - Friday 8:00 a.m. - 4:00 p.m.


From swimming to the big guns’ sheer firepower: Lieutenant-Colonel Sarah Heer

October is Women’s History Month in Canada and this year’s theme is “Claim your place”. Since Confederation 150 years ago, many capable and strong women have claimed their rightful places in our country’s proud history, including those serving in the Canadian Army (CA). Here is the second part of a profile of one such woman, Lieutenant-Colonel Sarah Heer, a member of the Royal Regiment of Canadian Artillery (RCA). Refer to Related Links to see the first article.
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