第831章 匈奴如狼
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在击败乌桓后，汉军便改变了进攻策略，并没有大举向北扩张，而是将上郡、北地郡和安定郡的胡汉民众全部撤回关中，并在北部高山上修建烽燧，白天点烟，夜晚举火，汉军当然不是想放弃关内的广大领土，而是实施防守反击策略，准备和即将杀至的匈奴大军决战。龙腾小说ltxs520.com
刘璟并没有因为击败乌桓人便头脑发热，他很清楚汉军目前和匈奴人的实力差距，主要表现在骑兵上的差距，此时他如果贸然大举北上，一旦遭遇匈奴大军，他们取胜的机会并不大，他们现在还没有汉武帝时的汉军实力，可以骑兵对骑兵，诛敌于千里外。
不过汉军也没有放弃关内辽阔的疆域，他们采用了布点的策略，所谓布点，就是在以坚城为依托，在关内地区建立军事据点，充分发挥汉军擅长防御的优势。
汉军在安定郡选择了高平县，在北地郡选择了庆阳县，在上郡选择了高奴县，这三个县的共同特点是城墙高大坚固，且县城建在高处，易守难攻，汉军以这三个县为据点，各驻扎五千兵力，并存储大量的粮食。
这天上午，刘璟正在高奴县视察防御备战，高奴县也就是后世的延安，此时的黄土高原气候温和湿润，到处是森林密布，随处可见草原，河水众多，水流清澈，汉武帝时曾大量移民和屯戍，使关内农业经济空前发展，被誉为‘新秦中’。
汉虞诩在《奏复三郡疏》上如此描述，“水草丰美，上宜产牧，牛马衔尾，群羊塞道”，也正是气候和地理环境非常适合游牧民族生活，胡人才会大举南下，占据了这片富饶且绿意盎然的高原土地。
高奴县位于北下关中的必经之道上，几条道路在这里汇聚，战略地位极其重要，所以又被称为‘三秦锁钥，五路襟喉’，春秋时期，魏国为了防御北狄入侵，在这一带修建长城和大量的关城要塞，秦朝在这里筑城建县，同时又修建了直通关中的秦直道，汉朝时期，高奴县屡经修葺，如今已成为塞北第一坚城。
县城位于一座高岗上，周长约十余里，只能算一座中县，但城高三丈，宽两丈，四周马面密集，利于防守，再加上它位于高处，站在城墙上向下俯览，有一种居高临下的优势。
刘璟站在城头向北眺望，蜿蜒流淌的区水在县城数里之外，在城头上清晰可见，水流缓处修建有码头，主要靠羊皮筏子渡河，汉军码头上又修建了三座哨堡，这也是高奴县的一大防御优势，匈奴骑兵席卷南下，必然会被区水阻挡，汉军便可在区水南岸建立第一道防御线。
刘璟任命张任为高奴都督，坐镇高奴县，主管三镇防御，这时，张任走到刘璟身旁低声道：“殿下觉得匈奴军会不会从东面杀来？”
“你是说左贤王刘豹会从东面杀来？”刘璟凝视东方，淡淡问道。
张任点了点头，“刘去卑北撤，刘豹唇亡齿寒，他又是刘去卑之弟，岂会坐视不管，如果他率大军从东面渡黄河过来，我们在区水建立的防御就没有意义了。”
“刘豹军队是否杀来，关键要看曹命曹彰率五万军增兵太原，这样，太原一线的曹军兵力有十万之众，聚集了徐晃、于禁、张郃、曹真等名将，我相信曹在大是大非的问题上不会站错队，十万大军就足以牵制住刘豹的军队，其实我们不必担心刘豹，倒是呼厨泉的匈奴本部，可能会大举南下。”
刚说到这，有士兵指着远处大喊：“快看，狼烟！”
刘璟也看到了，远处十余里外的烽燧点燃了三道狼烟，直冲天空，这表示有大军到来，当然，狼烟实际上是从四百里外的长城烽燧传来，匈奴大军要杀到高奴县，至少还要两三天时间。
张任急忙道：“这必然是匈奴大军南下了，请殿下离开返回关中，不要身处险境！”
刘璟却眉头微皱，匈奴大军这么快就南下了吗？这有点出乎他的意料，此时三万军队正在各地抢收刚成熟的麦子，如果匈奴军队这时候南下，对收麦汉军将形成严重威胁。
这时，法正慢慢走上前道：“殿下，我倒觉得匈奴此时南下未必是针对我们。”
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