Originally Posted by
Mehrunes
But how could they possibly achieve that without killing the Night King? He can just resurrect the dead by lifting his hands up, giving the First Men no reprieve in fight against him personally as long as he was alive. Even if they were killing the wights with obsidian rendering them useless, he'd still have the corpses of the fallen First Men themselves. Corpses that they wouldn't have the time to burn while being locked in combat against the Night King.
Even if the First Men sent a massive army north of where the Wall would be to stall the Night King while the Wall was getting constructed (and even then it would only work if someone pulled the Wall out of their ass in an instant), those people would be doomed. And the Night King would just simply get a fresh army. So even if the Wall was pulled out of someone's ass in an instant, what would have stopped the Night King from ordering his fresh army made from the corpses of the sacrificial army that was to stall him to swarm the Wall World War-Z style, as his wights were doing in the battle for Winterfell?