Well, the expendables are almost indestructible, but... don't underestimate Liam Neeson when someone touches his beloved daughter. I think he would first find out who they are, then he would study all their weaknesses and after some serious surveillance and careful planning, he would pass them easily and maybe kill one or two. He is not an idiot, he would know what kind of people he had to deal with so he would prepare himself for a different type of battle. He would use any means in his arsenal to do so. He might not succeed, but he would take some of them with him.
My bet is on him.
Let's give Liam a chance, ha ha!
Hope it helps! ;)
My wasted mind...