"Escape to Salvation" - "Magnificent Retreat" [Campaign 4, Mission 4]

I couldn't defeat Ilay (I tried 100 times, but I couldn't win; there are too many succubi, and they quickly eliminate the archers). I simply directed Zehir towards Talongard and managed to stop Ilay. Zehir's army is the same size as Biara's, but it has about 90 titans.