Actually there are some howitzers scattered around towns, you can use them to kill the tripods. I find it very fun to be able to use them.
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Nah I know, I mean the artillery men near the ironclads, they don't move and you can't take their cannons. I've never seen a tripod go anywhere near them so I can only assume they're completely functionless.
The howitzers are sick, I love that a good, lucky shot can take down a tripod in one hit, but it's balanced because they're so difficult to aim. I just mean the npcs that never seem to move and also the ironclads I don't think shoot but they totally should.