Correct

战死

/ zhàn sǐ / 
Strokes

Example

As a Verb

die in battle; be killed in action/combat

1
Tāmen
他们
qíngyuàn
情愿
zhànsǐ
战死
  
。

They are willing to fight to death.

2
Zhànsǐ
战死
jiāngcháng
疆场

be killed on the battlefield