Answer: bulwark

AnswerCrossword Clue
BULWARKDefensive wall
BULWARKMainstay
BULWARKStrong support.
BULWARKProtection
BULWARKRampart where el toro ambles?
BULWARKFortification
bulwarkto fortify (to strengthen against attack)
bulwarkdefense wall
bulwarkprotection