He said to him, Oh, Lord, with which shall I save Israel? behold, my family is the poorest in Manasseh, and I am the least in my father's house.
So here was Gideon hiding from the Midianites as he was threshing the wheat because if the Midianites had caught him they'd take the wheat. And so he was out by the winepress threshing wheat and here was an angel sitting under an oak tree.