3 sentences

1. 阵地上架着一挺机枪。

   zhèn​dì shàng jià zhe yī tǐng jī​qiāng.

   A machine gun was set up at the position.

   Source: Dong Chinese Dictionary

2. 他在阵地上架起了一挺机枪。

   tā zài zhèn​dì shàng jià​qǐ le yī tǐng jī​qiāng.

   He set up a machine gun on the position.

   Source: Dong Chinese Dictionary

3. 士兵们在阵地上架起了重型机枪。

   shì​bīng men zài zhèn​dì shàng jià​qǐ le zhòng​xíng jī​qiāng.

   The soldiers set up heavy machine guns at the position.

   Source: Dong Chinese Dictionary