2 sentences

1. 与敌人交战！

   yǔ dí​rén jiāo​zhàn!

   Engage the enemy!

   Source: OpenSubtitles

2. 双方军队在边境地区激烈交战。

   shuāng​fāng jūn​duì zài biān​jìng dì​qū jī​liè jiāo​zhàn.

   The two armies are fighting fiercely in the border region.

   Source: Dong Chinese Dictionary