Oath of Peace

Hopefully the spoiler tag deters players lol but I have a question concerning the Oath of Peace. If it bars the gods and titans from attacking each other, why can Sydon demand Pythor's daughter as a sacrifice and threaten to send his army to destroy Estoria if his demand isn't met? Maybe it's as simple as "he's not directly attacking", but then why do the gods not simply raise an army to Assault Sydon's tower? Am I missing something? I backed the campaign from the beginning and have had the books this whole time but am just about to start running it for the first time

Edit: Thank you everyone for the replies/suggestions/perspectives! Very helpful