第764章 凤凰城
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与以前朝代经营长城的理念不同，李超提出的北方内外三关防御计划，虽然也是以长城为依托，但不是线性防御，而是以几个重要的节点为核心，四面八方互为犄角互为应援的防卫集群，是点状防御网。
突厥人雄踞北方，尤其是在占据着代北和河套的形势下，河东和河北，是最易被进攻和突破的方向，一旦突破长城一线，就能进入平原地区，尤其是河北平原，如果让突厥人进入河北平原，那广阔的平原地区就极难防御突厥骑兵。
为此李超才提出了这个北方内外三关的防御计划。
他舍弃了过去内外长城的两道防御层作法，而是在北方东西向形成外边与内边两道线，改过去南北防御层为东西防御层。
在河北太行山脉北部，沿线设置紫荆、倒马、居庸三关，以此三关建立堡垒集群，形成纵深防御圈，保护河北平原。而在河东西北，设置偏头、楼烦、雁门三关，为外三层，这外三关就是第一层防御集群。
李超的这内外三关的防御重心，其实是在河北。内外三关重重把守，就是要保证突厥人不能从河套、代北这些突厥人的前进基地经代北突入河北平原。
在这种思想下，情愿让他们突进河东中部，也不能让他们进入河北平原。
外三关的防御任务极重，偏头关在极边，雁门为冲要，而楼烦关介于二关之中，控扼边关之首，形势极重。
突厥人一直都还以为，大唐的河东防御重心在雁门关，其实他们根本不知道，大唐的北方防御思想早就改变了。
朝廷以重兵屯于楼烦关，以此方便东可以卫雁门，西可以援偏关，向北还可以出云朔。
李超指着那连绵的山谷，向平阳和苏烈他们道，“楼烦关的地理位置，极为特别，尤其是在当前突厥人所占据的形势来看，他们要南下，必经三关。朔方有沙漠戈壁，那边进攻不便。因此主要还是往东面南下，从这边南下，必经三关。”
“三关中，偏关有黄河做为天险，因此从河套过来的突厥人，只有在冬季的时候才可以踏冰而过。而雁门关，以山为天险，骑兵难以突破。唯有楼烦关，所靠虽有恢河，但恢河是季节性的河流，每年都有一段时间断流，因此秋季断流季节，突厥骑兵就能沿河谷浑师南进，直抵关下。”
恢河河谷比较宽，李靖向朝廷的报告中说的是可容十骑并进。
正因为这个独特的原因，使得外三关中的中路楼烦关，成为更容易突破的节点。只不过现在突厥人还不知道，这里已经修建了许多堡垒集群，楼烦关更是成为周围七里，内外两层关城的战争要塞。
点状的堡垒防御集群，比起过去的长城线状防御，有一个优势之处在于，更能独立支撑作战，不易突破。
这种防御方式，比起长城的线性防御来说，对于小股草原骑兵袭扰劫掠，远不如长城。因为长城是全面防御，小股的骑兵是没法破城墙或者破关而入的。唯有当大量草原骑兵南下时，长城就会显得薄弱，高口和长城以及关隘，都难以应付大量骑兵。
而李超打造的这种点状堡垒集群不同，重点是在要塞和周边的墩堡等，是点式的，城堡中间会有空隙，小股的骑兵很容易渗透进来，他们如果只是来抢劫，不能完全防的了。但如果是防大股骑兵，这些堡垒群，却能相互应援，更能支撑防御，一时难被攻破。
宁武关城很大，但只是宁武关的南口，在北面二余十里，还有一个北口。
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