Wonder Woman has used two shields that seem to have magical Amazonian properties, used during battle. The shields is used as an alternative to the Bracelets of Submission as a defensive weapon, protecting Wonder Woman from both ranged and melee attacks alike.
Much like the Bracelets of Submission, Wonder Woman's shields are virtually indestructible, her second one being capable of deflecting even a tremendously powerful and destructive thermal attack from the monster Doomsday. Hence, due to its tremendous durability, it can also be used as an offensive weapon, with Wonder Woman smashing the shield hard into the legs of Doomsday, thus momentarily managing to knock him down.
The shield being used offensively
On the battlefield of No Man's Land in WWI, Wonder Woman shields herself from harm.