The Goblins knew the weapon as 'biter' and it was made specifically to fight against them.
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They killed other goblins because winning was hopeless
No, the goblins did not get Gandalf. Bilbo's yell when he discovered the goblins stealing things was enough to prevent him from being captured. Gandalf killed a number of the goblins with a big flash of lightening.
It was the Battle of Five Armies. The armies were the humans, elves and dwarves against the wargs and the goblins.
wargs
a grund of goblins According to the New World Encyclopedia: 'A group of goblins is referred to as a "horde."'