Correct

伏兵

/ fúbīng / 
Strokes

Definition

hidden troops/ambush

Example

As a Noun

troops in ambush; ambush

1
Fúbīng
伏兵
de
的
xíjī
袭击

assault from an ambush

2
Fúbīng
伏兵
sìqǐ
四起

with soldiers leaping out from ambush on all sides

3
Shè
设
xià
下
fúbīng
伏兵

lay/make/stage/set an ambush (for)