Knightfall
World of Kulan DM
I forgot to include this in what Caerth would have known when dealing with a swarm of flying creatures...Hmm, gust of wind is actually a pretty good idea... If that doesn't work, he'll use wild shape next round.
"Swarms made up of Diminutive or Fine creatures are susceptible to high winds such as that created by a gust of wind spell. For purposes of determining the effects of wind on a swarm, treat the swarm as a creature of the same size as its constituent creatures." -SRD