November 29, 1971: Traded by the Houston Astros with Ed Armbrister, Jack Billingham, Cesar Geronimo and Denis Menke to the Cincinnati Reds for Tommy Helms, Lee May and Jimmy Stewart.
So the Reds got the best player in baseball, a pretty good starter and a starting center fielder for May (2-3 win player) and Helms (1-2 win player).