Can you tell me how "Man o'war" would be translated? Men of War or something like that?

And what does O' mean in English?

I also read this sentence "‘Coin be damned". Heres is the context

Roth spat on the skeletal warrior’s decapitated remains and ran onward into the burning city, using the least rotten of his teeth to pry the emeralds free from his trophy as he went. ‘Coin be damned,’ muttered Roth, spitting out fragments of bone, but he pocketed the gems anyway.

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