St. Peter’s was the regimental church for the 40th Northumberland Regiment and their Colours were deposited in the church on November 25, 1923. The 40th Northumberland Battalion of Infantry was authorized to be formed in Cobourg, Ontario on 5 October 1866 and re-designated 40th Northumberland Regiment on 8 May 1900.
In earlier times, Colours played a prominent part in many battles. They served to identify units in battle, often marking the focal point of a struggle. Captured Colours were a prized trophy and attracted enemy attention and inspired much gallantry. By the late 19th and 20th Century, however, they were no longer carried in battle, but their status as the heart and soul of a Regiment continued, and the laying up of Colours signifies and helps keep holy the memories of the men who sacrificed their lives.