Crossword clues for defensive structureAnswerClueFORTDefense structureFORTDefensive structureFORTOater defense structureFORTSDefensive structuresFORTRESSDefensive structureRAMPARTDefensive structureSTOCKADEDefensive structure.REDANDefensive structure.MOATDefensive structure encircling a castleSEAWALLSCoastal defense structuresPALISADEDefensive structure