The Erymanthean Boar
Herakles' third (sometimes considered fourth) labor, pitting the hero against the huge wild boar of Mount Erymanthos. 
A rare bloodless affair, it required some enticing into open space, chasing in the deep snow, and finally old-fashioned wrestling on Herakles' part. The very sight of the captured but angry beast prompted the wretched and cowardly king Eurystheus to seek last-minute refuge in his bronze jar. However, a large part of the tale of this labor is concerned with a side adventure during the journey to Mt. Erymanthos - the hero's encounter with centaurs in Pholos' cave.