Significados de mycenaean shields en inglés

With the disappearance of the war chariot the huge Mycenaean shields had vanished or were very rarely used.

Some scholars, then, believe that the old original poet always described Mycenaean shields, which are of various shapes, but never circular in Mycenaean art.

What manner of military needs prompted the invention of the great Mycenaean shields which, by Homer's time, were differentiated by the addition of metal plating?