Maybe instead of going big you could make it personal? Somebody is specifically trying to kill a group of Lanterns for their rings and lures them there under the threat of 'I've got your *whatever*, if you ever want to see them alive again you'll come alone.' Each Lantern would come for their own reason and their Corp itself wouldn't be involved.

You spring the armies on them then, using some Macguffin to negate communications and keep them from escaping.