18 hours 54 minutes
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内容简介: 北周大定元年(581年),文帝杨坚代周建隋之初,南有陈朝,北有突厥,东北有高丽,西北有吐谷浑,在战略上处于被包围态势。文帝为巩固政权,打破包围,并进而统一全国,采取'内绥外御'的战略总方针,企图先灭陈朝,再攻突厥。但因突厥实力强大,又有奚、契丹等族相助,不仅联合原北齐营州剌史高宝宁攻占临渝镇(今山海关),而且出军40万大举攻隋,严重威胁北方,文帝被迫改取南和北战、先北后南的战略,首先对付突厥。