Worshipper – “Conquest” [Campaign 2, Mission 3]

Here's the situation: I killed the main boss at the outpost at the very beginning, and... (it's a shame I only realized it at the end of the mission) the objectives didn't change; they remained "Capture the border!" As a result, I wiped out EVERYONE, captured EVERYTHING, and the green player disappeared (he ran out of heroes and cities + the week came to an end!)!!! But the mission still doesn't end!(!

Guys, does anyone know what to do??? Has anyone else encountered this??? It's a pain to have to start over on "Veteran"(((

P.S. Immortal Agrail still wanders that land to this day!)!