2 sentences for 苦战 (kǔ​zhàn)

1. 战士们经过一番苦战，终于夺回了高地。

   zhàn​shì men jīng​guò yī fān kǔ​zhàn, zhōng​yú duó​huí le gāo​dì.

   After a fierce battle, the soldiers finally retook the heights.

   Source: Dong Chinese Dictionary

2. 经过数月的苦战，团队终于攻克了技术难关。

   jīng​guò shù yuè de kǔ​zhàn, tuán​duì zhōng​yú gōng​kè le jì​shù nán​guān.

   After months of hard struggle, the team finally overcame the technical difficulties.

   Source: Dong Chinese Dictionary