<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> 85,231--104,256 ("present for duty") </Td> <Td> 75,000 </Td> </Tr>

What was the objective of the battle of gettysburg