Fortifications are structures designed to shield against enemy attacks. Synonyms for fortifications include ramparts, walls, barricades, bulwarks, parapets, moats, and battlements. Ramparts are large embankments with a broad top where guns and soldiers can be stationed. Walls are masonry or brick barriers that separate territories and protect them from invaders. Barricades are improvised or temporary structures used to block off passageways or roads. Bulwarks are defensive buffers created to deflect or absorb assaults. Parapets are defensive walls that protect soldiers of high ground. Moats are ditches filled with water used to protect castles and forts. Battlements are defenses on castle walls, with gaps in them to shoot arrows, cannons, and to see the enemy.