第1331章 蓟镇锁京畿4
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时任蓟辽总督的王抒不知是计,连忙调集蓟镇中部的主力部队向东驰援,加强东部关口的防守。就在中部守军兵力空虚之时,鞑靼主力突然集中兵力猛攻潘家口,一举突破了这处关隘。
鞑靼骑兵渡过滦河,直抵三屯营,随后又向西劫掠遵化、丰润、玉田、蓟州等州县,如入无人之境。他们兵分多路四处劫掠,让明军首尾不能相顾。等到王抒反应过来,调兵回援之时,鞑靼军队又转而向东,攻下了迁安等地,在一番大肆劫掠之后,从容地从潘家口退出长城。明军疲于奔命,却始终抓不住敌军主力,只能眼睁睁看着鞑靼人满载而归。这次入侵给京畿地区造成了极大破坏,暴露了蓟镇防线的致命缺陷,也让整个明朝朝野为之震动,让朝廷意识到仅凭现有兵力根本无法守住如此漫长的防线。
第四次重大战事,是洪山口之战。天启七年,后金的皇太极率军攻打宁远、锦州,却在明军的顽强防守之下兵败而归。宁锦防线让皇太极屡屡碰壁、损失惨重,于是他改变了进攻策略,选择绕开坚固的宁锦防线,借道蒙古草原,从防守相对薄弱的蓟镇长城入关,以此消耗明朝国力,掠夺人口与物资。
到了崇祯二年,皇太极率领八旗大军绕道蒙古,突然出现在蓟镇长城之外,攻打龙井关、大安口、洪山口等处关隘。这些关口原本并非防守重点,守军兵力薄弱,根本抵挡不住八旗精锐的猛攻,很快便相继失守。后金大军一路势如破竹,很快攻陷了遵化城,随后继续向西推进,接连拿下三河、通州,兵锋直指京城城下,对德胜门、广渠门、卢沟桥、永定门等城门发起猛攻,京城陷入重重危机之中。
当时后金的诸多将领纷纷向皇太极请命,要求一鼓作气攻下北京城。皇太极却认为明朝在京城周边仍有不少兵力,各地勤王兵马也在陆续赶来,此时并非夺取京城的最佳时机,于是没有强行攻城。他率领大军在京畿地区大肆劫掠之后,转而向东进发,接连攻陷香河、迁安、滦州、永平四座城池,留下兵马驻守,以此作为日后入关的据点,随后才率大军从冷口退出了长城。这次入关让后金摸清了明朝内地的虚实,也让明朝的统治危机进一步加深。
第五次重大战事,是昌平之战。崇祯九年四月,皇太极再次派遣大军南下,这次规模更胜以往,十万八旗铁骑浩浩荡荡,攻破独石口,从居庸关攻入长城之内,直奔昌平而去。昌平是明朝皇陵所在之地,地理位置十分重要,后金军攻下昌平之后,便以此为据点,分兵四处劫掠。
后金骑兵在京畿腹地肆意蹂躏,铁蹄踏遍了良乡、顺义、清河、怀柔、宝坻、房山、涿州、永清等诸多州县,所过之处百姓流离失所,城池残破不堪。从北部的怀柔、顺义,到南部的良乡、涿州,再到东部的宝坻、永清,后金骑兵纵横驰骋,明朝守军要么龟缩在城中不敢出战,要么一触即溃,根本无法组织起有效的抵抗。直到后金军队劫掠了整整五个月,将京畿之地的财富与人口掠夺殆尽之后,才带着丰厚的战利品,于当年九月从冷口退回塞外。这次入关进一步消耗了明朝的国力,也让本就拮据的朝廷财政更加雪上加霜。
当初朝廷设置蓟镇,目的并不仅仅是抵御蒙古骑兵的南下入侵,还有一层重要的考量,便是借此牵制九边中的其他边镇以及京城的京营兵力,起到防范地方叛乱、稳固中央统治的作用。九边各镇都握有重兵,若是某一处边镇的将领心生异志、起兵叛乱,便会对朝廷构成巨大威胁。蓟镇紧邻京城,手握重兵,既可以随时驰援京城,也可以对周边的宣府、大同、辽东等镇形成牵制,防止边将拥兵自重、犯上作乱。
与此同时,朝廷也考虑到其余的边镇沿着边境线一字排开,戍守的防线绵延长达数千公里,兵力分散在各个关口墩台之上,很难在战事爆发时迅速集中力量应对。因此特意设置蓟镇,将其打造为抵御蒙古入侵的预备防线,一旦某处边镇出现险情,蓟镇的兵马便可迅速驰援。同时蓟镇也能与京营的兵力互相呼应、互为补充,共同拱卫京城安全。京营是驻守京城的中央军,负责京城宿卫,但京营兵马久居内地,缺乏实战经验,战斗力有限。蓟镇边军常年驻守边境,久经战阵,战斗力较强,作为预备防线,可以在敌军兵临城下时配合京营共同守城,弥补京营战力的不足。
在蓟镇历任的统帅当中,最为著名的当属戚继光。戚继光调任蓟镇总兵之后,针对蓟镇边防的诸多弊病进行了大刀阔斧的改革。他先是对边墙进行了大规模修缮,在城墙之上修筑了上千座空心敌台,敌台之中可以驻守士兵、存放粮草兵器,极大提升了边墙的防御能力。同时,他还从浙江带来部分戚家军旧部,以此为骨干训练蓟镇守军,严明军纪,操练阵法,改良兵器,让原本军纪涣散、战斗力低下的蓟镇守军面貌焕然一新。戚继光还根据蒙古骑兵的作战特点,创造了专门的车营战术,以战车为屏障,配合步兵、骑兵与火器部队,
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