Athena helps the Greek build the Trojan horse. Although the idea was Odysseus', it was Athena who gave him the idea, and she was helping him afterwards again and again.
Yet another Link.
All images are from Wikimedia Commons and are photographs of pottery in the Staatliche Antikensammlung Müchen.
If you are in Munich, and have time to spare, go there and look at the fabulous exhibition, on Sundays entry fee is only 1€.