"bella movet clipeus"

The shield of Achilles gets a couple of hundred lines of description from Homer, and has provoked thousands of pages of commentary.

One view of the shield is offered here, with an outline of the way this author thinks it was laid out.

And here's a blog that offers numerous images of the shield as well as the Homeric text.

Virgil also offers a shield of Aeneas, brought to the hero by his mother, Venus, who "persuaded" Vulcan to create it. An interesting comparison of the shields of Achilles and Aeneas is offered by John L. Penwill.