Correct

交兵

/ jiāo bīng / 
Strokes

Definition

in a state of war

Example

As a Verb

(of two or more parties) be at war; wage war

1
Liǎng
两
guó
国
jiāo
交
bīng
兵
  
,
bù
不
zhǎn
斩
lái
来
shǐ
使
  
。

Two countries at war will not kill each other's envoys.