Gah. I got caught in that exact same location against a very large mak army - but I only had pyrrhos, 15 elephants, 2 beat up phalanx units, and half of a unit of illyrian infantry. The hill is enormous and in the bottom corner I tried to hold out. The battle ran the entire timer out - for some reason they didn't want to commmit their guys and lose that huge mountain top they were stationed on - so they sent out some archer and akontistai units first, and I used pyrrhos and the illyrians to rout them just barely. The whole army was coming down the hill when time ran out. I'll never get stuck in that place again - I'll tell you that!!