User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-202.156.13.10-20121112140649/@comment-3498371-20121112145033

Maybe they should just literally get the Hecate cabin on the pegasi. Remember, if you drop one of the stones it will either explode or turn everyone within half a mile into trees. So the pegasi (or the demigods riding them) can just drop the stones onto the roman army and within a few minutes, they would be destroyed.