Orc tactics against Dwarves.

Fellow warriors, help me out! I can’t seem to beat my friend when he plays as the Stronghold faction. He plays with Gnomes (runes are powerful, but his strategy is terrible). I’ve tried everything! Can you suggest a tactic against these “beer barrel” units? We’ve been playing for about 3 months. I use Krag as my hero, and his skills are maxed out to level 20: Expert Attacker, Expert Leader, Permanent Luck, Battle Fury, Tactics, Influence, Rallying Cry, Aura of Swiftness, Bloodlust, Reinforcements, Magic Resistance, and Basic Defense. He always uses Ingvar.
P.S. I need real, working tactics, not just guesses. Thanks in advance to everyone who responds.