The antonyms for taking prisoner are releasing or freeing. When someone is released, they are no longer held captive and can go about their normal lives. Freeing someone involves setting them free from captivity or bondage. Other antonyms for taking prisoner include surrendering, abandoning, or withdrawing, which involve giving up one's hold or control over someone or something.
When prisoners are released, it is often a time of joy and celebration, as they are able to reunite with their loved ones and return to their everyday lives. Conversely, when prisoners are taken, it is a time of fear and uncertainty, as their freedom is taken away and they are forced to submit to the authority of their captors.