After serving in the UK on anti-invasion duties, on 10 July 1943, the battalion landed in Sicily as part of Operation Husky where it fought for 38 days.
The battalion would then on 3 September 1943, take part in the invasion of Italy and would serve with the rest of the I Canadian Corps in the Italian Campaign.
On 30 September 1945, the overseas battalion of The Carleton and York Regiment was disbanded.
[2] On 1 June 1945, a second CASF component of the regiment was mobilized for service in the Pacific theatre of operations with the re-raised 6th Canadian Infantry Division (Canadian Army Pacific Force) for service as part of the proposed Commonwealth Corps for the planned Invasion of Japan.
This unit was designated as the 2nd Canadian Infantry Battalion, (The Carleton and York Regiment), CASF.