<P> Below is charted the average make - up of the infantry for both sides . </P> <Table> <Tr> <Th> unit type </Th> <Th> low </Th> <Th> high </Th> <Th> average </Th> <Th> most frequent </Th> </Tr> <Tr> <Td> corps per army </Td> <Td> </Td> <Td> </Td> <Td> 2.74 </Td> <Td> </Td> </Tr> <Tr> <Td> divisions per corps </Td> <Td> </Td> <Td> 12 </Td> <Td> 3.10 </Td> <Td> </Td> </Tr> <Tr> <Td> brigades per division </Td> <Td> </Td> <Td> 7 </Td> <Td> 3.62 </Td> <Td> </Td> </Tr> <Tr> <Td> regiments per brigade </Td> <Td> </Td> <Td> 20 </Td> <Td> 4.71 </Td> <Td> 5 </Td> </Tr> </Table> <Tr> <Th> unit type </Th> <Th> low </Th> <Th> high </Th> <Th> average </Th> <Th> most frequent </Th> </Tr> <Tr> <Td> corps per army </Td> <Td> </Td> <Td> </Td> <Td> 2.74 </Td> <Td> </Td> </Tr>

What were the tactics of the civil war