First, fear is a complete game changer at low points. It seemed like every time I got into combat with Joe's Spear horde, he failed his fear test and I just slaughtered him.
Second, when artillary is on, it is very tough to get to it. I had 2 sabertusks, and the first game they got to the hellblaster and the cannon blew itself up. Very easy win for the first game for me. Game 2, his artillary could not miss, and it brought the pain. I ran every thing I could towards it, but to no avail. Engineers are key.