[1][2][3][4] With the passing of the Militia Act of 1855, the first of a number of newly raised independent militia companies were established in and around the Northumberland County region of Canada West (now the Province of Ontario).
On 5 October 1866, the 40th Northumberland Battalion of Infantry was authorized for service by the regimentation of six of these previously authorized independent militia rifle and infantry companies.
Its Regimental Headquarters was located at Cobourg and had companies at Cobourg, Campbellford, Brighton, Cold Springs, Grafton, Colborne, Castleton and Warkworth, Ontario.
[1][3][5][6] On 26 August 1939, details from The Midland Regiment were called out on service and then placed on active service on 1 September 1939, for local protection duties under the designation The Midland Regiment (Northumberland and Durham), CASF.
After its arrival in the UK, on 18 January 1945, the battalion was disbanded to provide reinforcements to the Canadian Army in the field.