The priestess, Pythia, foretold the how the Greeks' "wooden walls" would keep them safe. It is believed that the "wooden walls" referred to what?

The priestess, Pythia, foretold the how the Greek's "wooden walls" would keep them safe. It is believed that the "wooden walls" referred to the fortress walls, the navy the homes of the Greek people, and the forests of the Peloponnesian peninsula.

I probably didn't spell that right but whatever