前哨部队 meaning in English

outpost

Runs a mobile reconnaissance outpost for the royal navy
她掌管着一支皇家海军机动侦察前哨部队
The battalion ' s outposts were called in
该营的前哨部队已被召回。
On the 18th and 19th the troops moved forward two days march , and the enemys outposts , after a brief interchange of shots , retired
十一月十八日和十九日，部队又在行军中连续不停地走了两昼夜，在短暂的对射之后，敌军的前哨部队撤退了。