Fair enough - if the bugs can operate outside visual range, that seems good. I guess with delivery covered in that fashion, what we'd need to figure out is how to get Kagome a good impression of the structure of the bridge or its supports, so that he can plan the demolition.
Oh, who am I kidding - just send enough explosives so that if it was the most secure bridge ever on most solid foundation, it'd fall. And then double that, to be safe.
There's no requirement that the canyon is still around when we're done, right?