"Don't worry, General. Although I was ambushed while I was complacent, they can not confront our large army. I'll do my best."
So, right after his forces were bombed, he confidently told the messenger from Gen. Chongong about his strategy.
He also tried not to let his guard down. His use of the mini-game strategy to isolate Kanghwa Island was based on his decision to choose the best battlefield in case of contingencies and dispatch as many of his forces there as possible.
But now, all his strategies fell flat.
"What the heck is going on now?"
When did his plan go wrong?
"Obviously, he was not as strong as this. I heard he had only three giant skeletons. I checked everything including the related threads and photos posted on their community bulletin..."
But the intelligence they got was when they confronted trolls on Sunyu Island. Since then, the Necromancer's whereabouts were never directly exposed to the community, so there was no way for Jahon to find out more about him.