It was uncertain how much time had passed; he vaguely remembered several fighters wearing the kingdom's army armor coming to his house. One of them kept yelling at him, but at that time, Benjamin's world was utterly silent, and he couldn't hear anything. Then the person waved at his companions and knocked Benjamin out with a punch...
When he woke up in the shelter, he finally understood the full extent of the incident.
From what Benjamin had heard, it was the dark red veil in the sky that caused the brutal devils to keep appearing and prevented mages and other reinforcements from entering.
Later, someone seemed to have broken into the center of the Devil's Army and shattered something that maintained the veil. This allowed the situation to be alleviated, and survivors like him were eventually able to survive.