第764章 凤凰城
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李超站在楼烦关城，与苏定方等一起巡视着这座关城。龙腾小说ltxsba.com
旁边是比李超先一步到来的平阳长公主，她已经接任了岚州都督一职，楼烦关是岚州东北的一个突出部，被朔州和代州夹在中间。
“大帅，楼烦关就雄踞于恒山余脉的华盖山上，临恢河，俯瞰东、西、南三面，周长四里，开有东、西、南三门。经过李绩和李靖两位将军镇守河不时的前后增修，眼下关城周围五里，城基五丈，项宽两丈半，城高三丈余。另外还有外围关城，夯土筑城，周长七里，加辟北门，有飞楼于其上，起名镇朔楼，因楼高如展翅凤凰，因此又被称为凤凰城。”
站在楼烦关高高的城墙之上，远眺北方，能够看的很远。
这座关城，南北较狭，东西为长，如今有内外两重关城，周长七里余，城墙高大坚固，四周箭塔、敌楼星罗棋布。
内城墙由原来的三丈余增高为四丈。
几座城门，还都用砖包墙，在城北华盖山顶还修筑了一座巍峨耸峙的护城墩堡。墩堡上有三层重楼，名为华盖楼。
这座楼烦关不但与内长城相连，而且在城北还修筑了一条长达四十里的边墙。
李超之所以对这些非常了解，那是因为整个楼烦关的加固计划最初就是出自他之手。
唐朝不修长城，但北方突厥势大，因此在李世民登基之初，李超就向李世民进过一个北方防御计划。他建议以李绩李靖这两员大将镇守河东河北，同时在河北河东重点打造几座关防，以此为防御突厥堡垒要塞。
李超的这个堡垒计划，就是以明朝的内外三关为核心。
李世民看过计划，并与李超仔细商议过后，最终采纳了这条建议，没有去大修长城，而是重点的加固了这内外三关。
大唐在北方的防御重点，便不再是线，而是六个点。
楼烦关，正是明朝时外三关之一的宁武关。
宁武关此时叫楼烦关，因此此地在古时是楼烦部落的。战国时，赵武灵王曾在此置楼烦关，以防匈奴。北魏时，广订、神武二郡先后治此，隋时则先后属崞县、静乐县。此时大唐，朝廷置岚州，楼烦关属于静乐县境内，与朔、代二州夹角交汇。
后来，唐置宁武郡，这是宁武关之始，取广宁、神武二郡尾字，但这时，这里还叫楼烦关。
不过虽然这里叫楼烦关，但其防御，经过这两年李绩和李靖二将的先后加固，这座关城之险，已经不输于雁门。
李超当初提出的北方长城内外三关，外三关就是偏关头和雁门关、楼烦关，内三关则是居庸关、紫荆关、倒马关。
外三关，就是在河东北部的西北面，以守偏头、宁武、雁门关所联结的内长城一线，是横亘晋北五百里的一巨大屏障，利用的是过去长城以及恒山险要的地势。
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