<Tr> <Th_colspan="2"> Units involved </Th> </Tr> <Tr> <Td> Army of the Potomac </Td> <Td> Army of Northern Virginia </Td> </Tr> <Tr> <Th_colspan="2"> Strength </Th> </Tr> <Tr> <Td> <P> 122,009 "present for duty": </P> ∼ 114,000 engaged (estimated) </Td> <Td> <P> 78,513 "present for duty": </P> ∼ 72,500 engaged (estimated) </Td> </Tr>

Why was the confederate victory at fredericksburg critical