To merge, you need to move one of your split units into the space of another, and then allocate all the points in the window at the bottom and click "merge". Are one of these steps not working for you?
Ah okay I succeeded, but it seems you DON'T have to move them onto the same space. I had them on two different cities, then clicked merge. The adjusting of points at the bottom was what I was missing. Thanks! Cool game btw
lol now my problem is that the opening scenario seems completely unwinnable. That two-Goliath force shows up and my guy isn't even intiating combat with the small units.