[Rules Question] Defending with multiple characters

By vermillian2, in The Lord of the Rings: The Card Game

So defending in this game is when you exhuast a character to resist enemies attack. There is a Tactic event that lets you defend with multiple...

How's that work? Their attack vs... my combined what? And then which character takes the damage?

I'm assuming their attack would be checked against you total defense, and you would be able to select which defender takes the damage.