To get this topic back on topic; "Burn declares on WUS".
This hadda be the first war I've seen where a tribe is destroying another tribe and then they decide "lets ally them" they'll help us win this world... I'm super confused where the thought process went on this one.
Burn with Sophie as duke warred WUS successfully but when Hazard/Meti took over, as ODIN and Balian are their friends and got their ego hurt by being rejected by Visine, they allied the remainder of WUS (even though it was basically free food at the time) and started plotting against Visine.
So the answer is: Burn leadership change caused the focus to divert from best for the tribe to best for the ego of Hazard/Meti which got this mess started.