This is metagaming knowledge to me. At this point unless you took a really long way around to the grove, you do not now what the goblins forces are, you haven't met Minthara. This is the situation Aradin's party run into. And at that point they were comparable to your party in fighting power and equipment. His estimate was that the goblins were top much for a small mercenary party too handle. And frankly if the goblins & their leaders were not controlled by a computer, but by another player would they still be easy to beat?
Depends on wether or not the companions are nerfed by the tadpole. If they aren't, and they're only lvl 1 for gameplay's sake, i'd say it's well within the capability of the party to take the goblin camp. Hell, in such a scenario Gale could do it on his own.
