Far from the noise of archers, in the places of drawing water, There shall they rehearse the righteous acts of Yahweh, [Even] the righteous acts of his rule in Israel. Then the people of Yahweh went down to the gates.
Now here's the next mention of Shamgar and it jumps all the way from Mount Sinai to Shamgar. It's interesting that not more is written of him in the text.