Yuánjūn gǎn dào, zhōngyú jiěmiǎn le chéngchí zhī wéi.
The reinforcements arrived and finally lifted the siege of the city.
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Literary / classical-flavoured. In modern speech you'd more often use 避免 (bìmiǎn, to avoid), 解除 (jiěchú, to lift/relieve), or 解决 (jiějué, to resolve) depending on which sense you want.
