Turbo, have you tried selecting the unit with its unit card in the bottom, central panel?[/QUOTE]

It doesn't work because the reinforcements are on the map yet and aren't available. There is a dead zone slightly outside the withdrawel area that still allows kills. You may have seen when pursuing routed units that you can continue to inflict losses even though your unit is across the red withdrawel line. You can see the bodies piling up but until your reinforcements cross the red line, you don't get control.