Fortifications are buildings, walls, or ditches that are built to protect a place and make it more difficult to attack. The government has started building fortifications along its eastern border. see also fortify = defence. Structure erected to strengthen a military position against attack. The defense of cities and trade centers, usually by high walls, has been important for centuries. The citadel was the fortress of the ancient world, appearing in cities of Egypt, Greece, and the Roman empire. By Classical Greek times, fortress architecture began incorporating ramparts (walled embankments) and towers. Roman fortresses of the 2nd century tended to be square or rectangular, and were usually of dressed (cut) stone. The medieval castle remained almost impregnable until gunpowder came into use
the addition of an ingredient for the purpose of enrichment (as the addition of alcohol to wine or the addition of vitamins to food) defensive structure consisting of walls or mounds built around a stronghold to strengthen it the art or science of strengthening defenses
A Stronghold is rated for defensive strength by the Fortification There are several levels of defense, ranging from simple wooden constructions, to advanced stonework castles