Azure seme-de-lis or, a castle embattled argent, masoned sable, over which a lozenge argent displaying the eagle of Poland gules.
(Glossary of Heraldic Terms)
Reviewing the map made of Louisburg in 1723, there is no indication that the Bastion de la Reine nor the Porte de la Reine were ever completed. In fact, there was no queen of that name when the term "de la Reine" was applied to these structures. There had been no Queen of France since 1683, when Maria Teresa had died. The next person to assume this title was Marie Leczinska, daughter of the King of Poland, when she married the 15-year-old Louis XV in 1725. For this reason, it is assumed, the heraldic device includes the eagle of Poland. The embattled castle with closed gate is the device common to all Porte vessel badge designs.
Porte-class gate vessel
Red and white
Badges Of The Canadian Navy by Arbuckle, J. Graeme. Halifax: Nimbus Publishing, 1987.
CFP 267 - Badges of the Canadian Forces, Minister of Supply and Services Canada, 1977.