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The ships of Stannis’s fleet. Note the fiery heart badge on the lead ship, and the fact that it has a golden, antlered stag head for a figurehead. It’s worth noting that the ships are caravels in style, a type of ship developed (in our world) in the 15th century by the Portuguese for the purpose of exploration. They’re not really warcraft. This is a change from the novels, where the bulk of military craft in the setting are war galleys such as were seen in the Mediterranean from ancient times through to the Renaissance.