2 sentences

1. 援军及时赶到，接应了被围困的部队。

   yuán​jūn jí​shí gǎn​dào, jiē​yìng le bèi wéi​kùn de bù​duì.

   Reinforcements arrived in time to relieve the besieged troops.

   Source: Dong Chinese Dictionary

2. 援军终于赶到，为被围困多日的城堡解围。

   yuán​jūn zhōng​yú gǎn​dào, wèi bèi wéi​kùn duō rì de chéng​bǎo jiě​wéi.

   Reinforcements finally arrived to lift the siege of the castle.

   Source: Dong Chinese Dictionary