Correct

外敌

/ wài dí / 
Strokes

Example

As a Noun

foreign enemy; enemy from without

1
Wàidí
外敌
yājìng
压境

foreign enemy bearing down upon the border

2
Wàidí
外敌
rùqīn
入侵

foreign invasion/aggression

3
Dǐyù
抵御
  
/
qūchú
驱除
wàidí
外敌

resist/repel foreign enemies