Board Thread:Battle Nations Discussion/@comment-63.153.231.145-20130707043633/@comment-4632427-20130707133338

First and foremost, don't bother fighting Armored Mammoths. Get some higher-level friends to clear them off your lawn for you.

Besides that, you should be able to handle the mammoths, raptors, and boars available to fight in the World Map, Raptor Nest, and Boar Badlands if you use the right tactics. Mini Tanks in the front row assisted by R3+ Gunners with Heavy Fire and units you get from missions (Battle Raptor, Bazooka Squad, Commando) can clear them out with little trouble at that level. That makes for easy gold, and quick promotion of your better units. I have a secondary account at level 25 right now, and it doesn't lack for gold as long as I farm the critters regularly; I'm actually running into problems with having too many units waiting for promotion at a time.