3 sentences

1. 幽州曾是北方的军事重镇。

   yōu zhōu céng shì běi​fāng de jūn​shì zhòng​zhèn.

   Youzhou was once a key military town in the north.

   Source: Dong Chinese Dictionary

2. 我军势如破竹，连克敌军数座重镇。

   wǒ jūn shì​rú​pò​zhú, lián kè dí​jūn shù zuò zhòng​zhèn.

   Our army advanced irresistibly, capturing several of the enemy's key strategic towns.

   Source: Dong Chinese Dictionary

3. 敦煌是丝绸之路上的重镇。

   Dūn​huáng shì sī​chóu zhī lù shàng de zhòng​zhèn.

   Dunhuang was an important town on the Silk Road.

   Source: Dong Chinese Dictionary