'Breastplate' was an Allied unrealised plan for an amphibious assault to be launched from Malta against Sousse on the north coast of Axis-held Tunisia as a means of speeding the defeat of the Axis forces in North Africa in conjunction with the land advances by Lieutenant General K. A. N. Anderson’s Allied 1^st Army from the west and General Sir Bernard Montgomery’s British 8^th Army from the east (November 1942).

In preparation for the landing, which was to have taken place in the last week of November, the cruiser minelayer Welshman was loaded with artillery, stores and additional boats, but the plan was then cancelled for lack of the required landing craft and also by the fact that the plan had been rendered superfluous by the general success of the Allied armies closing in on the Axis beach-head in Tunisia.