Despite what the original poster stated, i have found through numerous attacks, that if you dont send cavalry(not cavalary original poster, please learn to spellcheck) then abatis have absolutely no effect on the attack. nada, zip, zilch. Abatis will not damage workers, or transporters.

It has gotten to the point that I only send cavalry out against valleys. Other than that they are just for defense, because they are way too expensive to suicide against abatis.

To reiterate, Abatis have ZERO effect on infantry and transporters. so leave the prima donnas at home and send in the grunts.