3 sentences

1. 部队从敌人的侧翼发起了突袭。

   bù​duì cóng dí​rén de cè​yì fā​qǐ le tū​xí.

   The troops launched a surprise attack from the enemy's flank.

   Source: Dong Chinese Dictionary

2. 我军采取迂回战术，从侧翼包围了敌军。

   wǒ jūn cǎi​qǔ yū​huí zhàn​shù, cóng cè​yì bāo​wéi le dí​jūn.

   Our army used flanking tactics to surround the enemy forces.

   Source: Dong Chinese Dictionary

3. 助攻部队成功牵制了敌人的侧翼，配合主攻部队完成合围。

   zhù​gōng bù​duì chéng​gōng qiān​zhì le dí​rén de cè​yì, pèi​hé zhǔ​gōng bù​duì wán​chéng hé​wéi.

   The supporting troops successfully pinned down the enemy's flanks, helping the main force complete the encirclement.

   Source: Dong Chinese Dictionary