Forrest
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On random maps, when playing as Barbarians, I usually play like this (at 160% difficulty).
I start with either a Kregg or a Gurnisson.
On day 1, I build Behemoths in the Castle.
On days 1-2, I recruit 3 bears and go to take everything that's available. The goal is to upgrade them and gain mass acceleration. If I encounter an opponent on day 3, 5 gray bears and mass haste should bring victory.
Regarding units:
Goblins – almost useless.
Wolves – a great unit.
Orcs – weak.
Ogres – the most durable tier 4 unit (attack and damage are simply excellent!).
Birds – a cool unit (speed and ability are great).
Cyclops – rarely used (usually not built).
Bears – the strongest tier 7 unit.