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Let's say my PMs have a bolt pistol and plague knife and they charge. So, they get 3 attacks, and plague knives are poison weapons. How many of those attacks automatically wound on a 4+? The marine is making melee attacks with the plague knife and his gun, but how many of those 3 attacks are considered poisonous?

All of them.

That's what I thoguht, but my opponent said no. Does it say anywhere in the rulebook?

BRB page 51, section titled "More than one weapon".

thanks!