Get into other Guild Cities/Battlekeeps without destroying their gate;
Get to the gate, crouch in front of it, face the gate and jump through it.
You might not get through on your first jump but just keep jumping and it will get you through, sneak attacks on Battlekeeps = win
Get to the gate, crouch in front of it, face the gate and jump through it.
You might not get through on your first jump but just keep jumping and it will get you through, sneak attacks on Battlekeeps = win