What information does Eris share with Cassian in Chapter 7?

Cassian meets with Vassa, Lucien, Jurian, and Eris. When Cassian is about to leave, Eris approaches him privately. Eris tells Cassian that he wants to work with him. He says that his father has pledged his forces to Briallyn and the war she wishes to start. The soldiers Eris is missing are the ones that went with Eris's father when the man went to the continent and met with Briallyn. Eris tells him they need to work together as allies.