Driller tactics is needed

[BoomBa]

Hi All.

Im not playing no-losses (although I do have level II no-loss medal), I actuallty like loosing a unit - that makes me try another new unit which makes the game more interesting

problem is : Im getting hard time defeating the Driller.

I read the 4 unit tactics (didnt actually understood why it is good but I've tried it...)
I need some tactics tips + armies type.

Currently Im a warrior 27lvl playing with:
1. Dwarf gunners.
2. 7 Archdemon (or archdevil dont remember the name) as tanks, great HP, teleoprt & Att/Def
3. Paladins - dont really like them
4. 6 Gaints - another tank unit
5. Assassins

I know there are not mixing togther very well (moral down) but Im still winning ALL the battles with almost (or none) losses.
Still, Im keep on loosing to the Driller - am I too weak ?
Any suggestions ?