第923章 防御漏洞（上）
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安乐郡也就是今天的北京密云一带，位于燕山脚下，是只有两个县的小郡，安乐郡北面是巍巍燕山，形成了幽州的天然屏障，但燕山又并非浑然一体，而是属于比较破碎的山地，其中两条大河贯穿燕山山地，一条叫沽河，从西北山地方向流入，一条叫鲍丘水，从正北方的草原流入。
沽河上中游也是经过起伏的燕山山地，地势险要，流经众多悬崖峭壁，只有冬天结冰时才能从河面上行走，军事价值不大。
而鲍丘水则从北方草原直接贯穿燕山，河床宽阔，是北方草原进入安乐郡的一条通途，具有极大的军事战略价值，其中穿越燕山的通道长约三十余里，叫做老北口，由于其外形似虎口，所以又叫做虎北口，安乐郡郡治燕乐县便位于虎北口最南端。
除了虎北口外，在东面五百余里外的北平郡，还有卢龙塞和临榆关也是塞外民族杀入幽州的通道，不过卢龙塞易守难攻，隋军屯有一千军守卫，而辽东也有五千隋军驻守，如果突厥从东面南下，首先就要面对辽东的守军，突袭就没有了效果。
唯有安乐郡的虎北口是一条南下的便捷之道，张铉当年从草原返回中原，就是从虎北口进入安乐郡，这里同时也是东面商道的主出口，北隋和铁勒各部的互市便是在这里进行。
张铉一行昼夜行军，在雪地上艰难跋涉，三天后进入了涿郡，涿郡军使麦孟才也意识到问题严重，他顾不得过新年，也率领三千军跟随张铉北上。
幽州原本是设立总管制度，总管又叫都督，下辖各郡军使，在罗艺时代形成事实上的割据，所以张铉在建立北隋后便废除了中原各州都督，只在高句丽单独设立都督，而在其他重要的边疆战略郡县设立军使制度，幽州都督也随之废除，变成了范阳、上谷、辽东三地军使，直属于齐王府统领。
都督的地位和卫一样，主将都为将军，军使则低一级，为虎贲郎将，范阳军使为麦孟才，下辖蓟县、虎北口、卢龙塞、临榆关四营，四营主将皆为鹰扬郎将。
范阳军使共统军七千人，其中蓟县三千，卢龙塞和临榆关各有一千人，虎北口则有两千军队。
大军在被大雪覆盖的官道上浩浩荡荡北行，麦孟才忍不住低声对张铉道：“大帅，如果突厥骑兵真有数百人入境，那么不仅郡丞有问题，恐怕驻军也有问题。”
“为什么？”
“卑职并不是说周元庆一定有问题，就看突厥骑兵是怎么过境，如果是集体一次性过境，那军队就严重失职，但如果是装扮成铁勒商人，陆陆续续进入中原，那军队也很难发现。”
张铉点点头，“我们调查后再说，但我现在更关心虎北口的防御，当年我走过一次，我印象中城关非常破旧，现在怎么样了？”
“去年年初倒是修葺过一次，不过是修建商城，不是修建军事堡垒，恐怕会让大帅失望。”
张铉冷冷道：“我不怕失望，我怕的是失察，等突厥大军从这里杀进幽州，那时我们才会追悔莫及。”
“大帅说得对，亡羊补牢，未为晚矣！”
两天后，两千精锐骑兵和三千步兵护卫着齐王张铉终于抵达了燕乐县，当大军抵达县城南门外时，安乐郡太守李翼，郡丞邵燕山和驻军郎将周元庆以及边市署正赵遂一起出城迎接齐王殿下的到来。
张铉问道：“谁是周元庆将军！”
周元庆上前一步，“末将在！”
张铉一挥手，“拿下！”
十几名士兵冲上去，将他按倒捆绑起来，周元庆拼命挣扎，“卑职无罪！”
“有没有罪，我等会儿再告诉你。”
这时，郡丞邵燕山脸色刷地变得惨白，向后退了一步，张铉锐利的目光已经盯住了他，“你就是郡丞邵燕山？”
邵燕山硬着头皮上前施礼，“卑职正是！”
张铉哼了一声，“一千两黄金拿着不烫手吗？”
这句话如五雷轰顶，邵燕山面如死灰，腿一软，顿时瘫倒在地，一句话也说不出来。
张铉一挥手，几名士兵上前将他反绑起来，
旁边太守李翼看得目瞪口呆，半晌，他鼓足勇气问道：“殿下，到底出了什么事？”
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