Strombran used to be our (Suville's) ally. After various incidents IG, it was felt that Strombran was using the war for their own gain, at the expense of Suville. This was spurred along by the, frankly, !@#$ed up diplomacy of Strombran and Tara, and the fact that Strombran's units actually lined with Tara to fight against Suville several times. Most notably in the recent Suville attack on Wynford. This, and the revelation that Strombran had decided to keep Riverholm, and never told Suville about that, caused Suville to declare that Strombran had betrayed them, and Suville disbanded the alliance, allowing Tara to immediately declare the war to prevent Strombran and suville from resigning the alliance. (As if we wanted to...)