i would think at least 10 physically fit men. 4 of them would have to immediately attack the back legs, with ferocity and pull them away from one another to break them. the other 6 would have to attack the face with the same ferocity. the bear is likely to pin one man down and maul him. someone has to gouge its eyes, while this is happening. it will infuriate him even more, but if its hind legs have been crippled, the men can back off for a few minutes and prod the bear, sporattically. it will waste the rest of its energy, in panic. after, that, taking turns of maliciously stomping the neck will soon kill the animal. success depends on disabling the hind legs. 2 men will probably die in the attack. 4 men will probably sustain untreatable wounds. 2 of the remaining 4 will sustain broken bones. 2 will make it relatively unharmed.