Yeah, I found the deck gun thing to be a little ridiculous in the early war. It becomes very dangerous in the late war, when even smaller cargo ships are armed with a couple of cannons and at least one machine-gun. It's not that they will necessarily sink you, but the AI aim-point seems to be right at your deck-gun, which means your entire gun crew can be splattered with one shot, I would think.
(I'm referring to the vanilla version of the game, as I haven't tried out any mods, yet)
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