2 sentences for 主攻 (zhǔ​gōng — main assault)

1. 部队决定从北面发起主攻。

   bù​duì jué​dìng cóng běi​miàn fā​qǐ zhǔ​gōng.

   The troops decided to launch their main attack from the north.

   Source: Dong Chinese Dictionary

2. 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