中世纪欧洲建城堡的目的,意义,及重要性,只要英文的

中世纪欧洲建城堡的目的,意义,及重要性,只要英文的
不要很长很长的那种,字数300~500个词左右~

Military,was born from the castle,to the prosperity has been the demise of the main line running through the castle's development has always been.The birth of the castle,from which its political environment,in general,the castle is a political division,a product of the separatist forces.Such as the Middle Ages in Europe,as the fief of the implementation of the system,making the ownership of land was distributed among the nobility that,in the hands of the Cavaliers,politically divided and the Empire,the Kingdom,Monaco,Knight territory,and so diverse,large and small feudal political entities Everywhere.No one has a clear border between them,and no one can fully sort out a clear link between them.The level of the feudal aristocracy among various reasons,often caused by the outbreak of war,they always prepare,often taking part in the war.All of the aristocracy are the equivalent of high-ranking military officers and their client will constitute its own officers and men at all levels.It is these all over Europe every corner of the size of the war,making the castle to highlight the role of defense.For example in Germany,only the territory of the Federal Republic of Germany,the existing ancient castle have 15,000 fully reflected Germany's medieval feudal state torn apart.Another war in the Middle Ages and the technical concept of war has also decided to war in the Middle Ages is a defensive war,at the time,the castle is the most reliable way of defense,the Rangers quickly enough to ward off attacks,will be the surprise-Su Juezhan into a war of attrition.As a result lords are widely repair the castle in order to ensure that their estate and property shall be inviolable.
So the castle is to protect the personal property of the Territory and the birth of the defensive architecture.Castle of the role of the military,has been around a castle.In general,the authority's view that it is of the view that the castle is a major development during the 9th century AD from the mound - the castle wall-14th century to the emergence of gunpowder weapons and the emergence of a period of time,it was also a period of time in the Middle Ages military experts known as the "castle period ."