The official strategy guide says javelins have an AP bonus. I looked at the RTR 6.0 txt file for unit descriptions and could not see an "ap" on any weapon attribute, but I am not a modder and maybe that is not how they are denoted. It certainly "feels" as if javelins are AP in RTR, although that may just be their very high attack value (15, IIRC). Personally, I suspect javelins may be a little too powerful in RTR although at least it generates interesting combined arms gameplay.
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