Achilles was hidden by his mother, Thetis, on the Island of Scyros, dressed as a girl.
Had a child with Deidamia there, Neoptolemus
Odysseus tricks Achilles into fighting: among the gifts for the kind was armor and weaponry. Arranges for a trumpet war-call, Achilles emerges
Odysseus pretended to be mad, Palamedes ruins the trick