由于乐寿、博野二县的地理位置特殊 ,唐中央在穆宗长庆元年利用成德镇内部出现分裂的时机 ,在这两县设置神策行营 ,并将两县原有的成德镇军士收编入神策行营 ,仍驻守原地 ,与中央平叛军队一起对付叛军。但是由于河北地区的叛军势力过于强大 ,乐寿、博野两行营的军队后来大多被迫撤出河北地区。此后原博野行营的部分军队仍名为博野军 Due to the special geographical location of the two counties of Yue Shou and Boye, the Central Committee of the Tang dynasty took advantage of the occasion of the split in Chengde Town in the first year of the Mouzonong County to set up a cease-fire camp in these two counties and transform the original Chengde Town The sergeant was incorporated into a clever camp, still stationed in place, and the central rebel forces together against the rebels. However, due to the overbearing power of the rebel forces in Hebei, the troops of the two camps of Yue Shou and Boyan were mostly forced to withdraw from Hebei. Since then, some of the original Bo field camp is still named Bo field army