Ключевые слова: algae, ancient, artillery, artillery piece, blue, cannon, castle, citadel, coastal, coastal defence, coastal defences, defence, defensive, engraving, firearm, grain, gun, iron, masonry, metal, military, mortar, ocean, old, ornate, parapet, ripples, sea, shadows, slabs, steel, stone, stonework, stronghold, wall, war, warfare, water, waves, wood, wooden, woodgrain,