The next morning, the servant Sosias announces Thebes' victory over Athens and the return of the Theban army. He sees a double of himself, who is actually Mercury, who acted as guard the night prior. Confusion follows.
The following morning, the attendant Sosias announces Thebes' triumph over Athens and the return of the Theban forces. He encounters a duplicate of himself, which is actually Mercury, who served as sentry the previous night. This leads to bewilderment.