He knew for any trap to be effective, you had to block any retreat route. So, the army waiting for him wasn't only one, but two.
Plus, he didn't know the exact location of the army he sent his two pets to, as he sent them towards the town outside the ring, threatening to devastate everyone there!
So, the hidden army in the vicinity would be forced to show itself up!
As for how they would know, it was so simple, as Arthur was being watched currently from the spies of this coalition army!
As for the first army, he had already sent the bait to lure it out!
So, he didn't delay and darted hurriedly towards the direction he sent Lily and others towards, as they acted as the bait to lure the second army out!
As for the spies, he wasn't worried about them, as the first army already moved out, if not it had started fighting with Lily and the other warriors there.
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