How many ASOIAF characters would be needed to defeat Aragorn, Legolas, Gimli, and Boromir?

As the title says, how many characters needed to defeat them...

1/10 times? 5/10 times? 9/10 times?

Assume all characters have their best equipment, no prep, random encounter. The characters would meet in a large field

Only human characters from ASOIAF. No dragons or white walkers

Can use books films or composite feats as you wish