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Since thunder hammers cause crew shaken on vehicles and drops initiative to 1, does that mean if you hit a walker with one and don't kill it will it's initiative drop to 1 and become shaken?

Absolutely not.

Do you "wound" walkers?

Also walkers have an I value; so you do not even get the Shaken bonus against them.

Yeah Kel seems on the ball here. You do not wound the vehicle, so you can't reduce its I to 1 from an unsaved wound. You shake it, but that does SFA against walkers... it might reduce their attacks by 1 (to a minimum of 1, but I can't remember if that's stunned or stunned AND shaken results...). But the way its worded ("against vehicles without an initiative value...") gives me the impression it is meant to reduce a vehicle with Initiative to I1, but RaW you don't cause a wound you don't reduce initiative.

-edit- upon rereading, no it looks like RaW you don't even get to shake them- it doesn't say what to do against a vehicle with a I value, as you can't wound them! This inclines me more to say that I think the spirit of the rule when it was written was to reduce walkers (the only vehicles with a I value, yeah?) to I1, but RaW you don't get . Nice one GW!

Against walkers it slips between the 2 cases. I agree that they probably meant walkers to be reduced to I 1, but the rules don't say so at the moment...

Thunder Hammers have no special effect against Walkers.

Against models which can be WOUNDED, they drop the model's I to 1 if they successfully wound and the model isn't killed.

Against vehicles WITHOUT an Initiative stat, you get a Shaken result for any hit.

Walkers are neither.