4 sentences

1. 士兵向战壕里投掷了一枚手榴弹。

   shì​bīng xiàng zhàn​háo lǐ tóu​zhì le yī méi shǒu​liú​dàn.

   The soldier threw a hand grenade into the trench.

   Source: Dong Chinese Dictionary

2. 士兵们躲在战壕里等待进攻的命令。

   shì​bīng men duǒ zài zhàn​háo lǐ děng​dài jìn​gōng de mìng​lìng.

   The soldiers hid in the trenches waiting for the order to attack.

   Source: Dong Chinese Dictionary

3. 士兵们挖掘了战壕以加强阵地的防御。

   shì​bīng men wā​jué le zhàn​háo yǐ jiā​qiáng zhèn​dì de fáng​yù.

   The soldiers dug trenches to strengthen the defense of their position.

   Source: Dong Chinese Dictionary

4. 冲锋号一响，战士们就跃出战壕向前冲锋。

   chōng​fēng​hào yī xiǎng, zhàn​shì men jiù yuè​chū zhàn​háo xiàng​qián chōng​fēng.

   As soon as the bugle sounded, the soldiers jumped out of the trenches and charged.

   Source: Dong Chinese Dictionary