Goblin coming over the walls.
If there are barracks outside the walls of the defending base and the barracks have been upgraded such that they have the ladders on the out side a goblin can take the ladder, use it to get over walls and lead the rest of the goblins with him. He should be about to do this all thru out the village/war base during an attack. They could even use the ladder to sworm the structures to loot them.
In regards of my last message
I didnt mean a fat rock xD
I meant an ugly......uh...
WELL IT WOULD LOOK STUPID NO MATTER WHAT