I’m pretty sure this was in the strip?
In short: they discussed paying the hobgoblins to leave, which probably would have worked and seems to be the common real world practice when dealing with barbarian hordes (at least since the invention of money).
However, the hobgoblins weren’t in charge, so asking what the hobgoblins wanted was a moot point.
Remember, Azure City wasn’t attacked by hobgoblins. It was attacked by a human sorcerer with a hobgoblin army.