So it was, when Israel had sown, that the Midianites came up, and the Amalekites, and the children of the east; they came up against them;
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.