I tried this out after noticing that a lot of my phalanxes kicked ass on a hill, but always got slaughtered when charging uphill.

I did a custom battle, and gave myself 3 silver shield pikemen as the seleucids. I gave the greeks 3 spartan hoplites. All units were at v0. I played on macedonian ruins.

I put my pikemen units 2 deep, and placed one unit on top of another, as was suggested in another thread on pikemen usage. I also had my units on the fairly steep hill on the right. The spartan hoplites attacked headon, and they absolutely got slaughtered. 240+ kills for me, and NO kills for them. The hoplites couldn't get past the pikes

I tried it again but this time put my pikemen on the fairly flat terrain in the center. This time when the hoplites charged me, they killed my pikemen fairly easily, and I ended up killing maybe 10 or so before my line collapsed and routed.

So it seems that at least in phalanx combat height plays a significant role, maybe extending the effective range of the pikes/spears somehow. Has anyone else noticed this?