I’m actually kind of surprised to hear that this is a challenge, but I think the difference is how important the different unit classes are now. I don’t mean to read as smug - I just haven’t played in quite a few months, and finally jumped back in over the past couple days to try Alpha 20. I decided, for the hell of it, to play RC in the forest.
When I saw this army, I too thought it was the end for me. I only had 6 in my militia. One Knight (Full Plate, Long Sword, Silver Shield), 2 Footmen (Iron Mail/Helmet and Pikes), 2 Archers, and one Cleric. Looking at the swarm of goblins and ogres, I thought there was no way I was going to hold them off.
I was so very wrong. The knight attracted the brunt of the attention, and barely went below full health with the help of the cleric. He damaged EVERYTHING around him at once, which made very short work of the horde of small goblins. They were all dead in moments (after running away from the fight terrified a few times), leaving the Ogres and some armored goblins. They just took time to beat down, but my small militia did not find any challenge at all.
So, that said, it sounds like making sure you have the full range of classes available is very important. Also, don’t underestimate the Knight and Cleric. They are very powerful units. I was actually lucky, and I was able to buy a Cleric’s book from a trader early on (the herbalist I find to be very hard to level up). This made every previous encounter nearly impossible to lose, as my footmen would never go below a full heart of HP. The addition of the archers was icing on the cake, increasing the damage output of the group significantly.