《先遣连》是以当年新疆军区独立骑兵师一团一连进军西藏阿里的先遣连为原形的电影。 1950年，为贯彻落实党中央、毛主席“进军西藏”、“解放西藏”的战略决策，新疆军区决定派一个连的兵力，先期进入西藏阿里地区，执行“侦查情况、发动群众”的先遣任务。1950年8月1日，由汉、回、藏、蒙古、锡伯、维吾尔、哈萨克等7个民族136人的先遣连，在总指挥兼党代表李狄三，连长曹海林等人的带领下，从新疆于阗出发，开始向阿里进军，胜利完成把鲜艳的五星红旗插上阿里高原，和平解放阿里30多万平方公里土地伟大壮举，用生命和意志谱写了一篇光耀日月的壮丽英雄史诗。
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