Correct

援兵

/ yuánbīng / 
Strokes

Definition

reinforcement

Example

As a Noun

reinforcements; relief troops

1
Yuánbīng
援兵
bèi
被
shíwànhuǒjí
十万火急
dì
地
pài
派
wǎng
往
zhànchǎng
战场
  
。

Reinforcements were rushed to the battle.