What does "astony" mean?

Astony: To stun; to bewilder; to astonish; to dismay. [Archaic] The captain of the Helots . . . strake Palladius upon the side of his head, that he reeled astonied. Sir P. Sidney. This sodeyn cas this man astonied so, That reed he wex, abayst, and al quaking. Chaucer.