Related by context. Frequent words. (Click for all words.) 63 forts 58 fort 57 fortification 57 fortresses 54 fortress 54 ramparts 52 watchtowers 51 bunkers 49 turrets 49 garrisons 48 impregnable 48 underground bunkers 47 earthworks 46 stockade 46 garrison 45 fortified 45 castles 45 embankments 44 armor 44 castle 44 artillery 44 encampment 44 gunboats 44 armaments 44 tombs 43 cannons 43 encampments 43 bombardment 43 edifices 43 armies 43 citadel 43 monuments 43 outposts 43 outpost 43 watchtower 43 stonework 43 tunnels 43 weaponry 43 battleships 43 hilltops 42 infantry 42 redoubt 42 encirclement 41 armored vehicles 41 sentries 41 infantrymen 41 Artillery 41 cliffs 41 caves 41 regiments 40 earthen 40 sentry 40 troop movements 40 archeological sites 40 Hadrian Wall 40 trenches 40 defenses 40 archeological 40 excavations 40 dikes 40 settlers 40 digging trenches 39 barricades 39 berms 39 foxholes 39 archaeological 39 arsenals 39 monument 39 army 39 barracks 39 dunes 39 Ypres 39 retaining walls 39 munitions 39 fortifying 39 structures 39 inscriptions 39 lighthouse 39 colonists 39 underground tunnels 38 heavily fortified 38 Cornwallis 38 airfields 38 perimeters 38 seaport 38 erected 38 escarpment 38 Confederates 38 dykes 38 massing 38 armory 38 Napoleonic 38 hideouts 38 cannonballs 38 rocket launchers 38 archaeological sites 38 sieges 38 walls 38 hedgerows 38 bund 38 arsenal