Dungeons 4: Werebor's End on "Extremely difficult" in 32:10. The Expendables.
One of the neat things about Horde units is how quickly they level up, especially with the right upgrades and perks. It tends to quickly make Horde armies a lot more powerful than Demon or Undead just because higher level units have better stats. Also as a bonus if the gnomes die you just hire new ones and a couple of fights later they're back up to full level, it's literally way faster than waiting for them to resurrect.
Also I hire one orc to give the +30% damage bonus to goblins and the one orc literally never dies, it's consistent across games. Kind of shows how weak inconspicuous is now the enemies just target the goblins anyway. And the reason I hire so many goblins is they do better damage than Orcs and pack in way tighter allowing way more to stab an enemy at once.