<Tr> <Td> Grand strategy (show) <Ul> <Li> Containment </Li> <Li> Economic warfare </Li> <Li> Limited war </Li> <Li> Military science </Li> <Li> Philosophy of war </Li> <Li> Strategic studies </Li> <Li> Total war </Li> </Ul> </Td> </Tr> <Ul> <Li> Containment </Li> <Li> Economic warfare </Li> <Li> Limited war </Li> <Li> Military science </Li> <Li> Philosophy of war </Li> <Li> Strategic studies </Li> <Li> Total war </Li> </Ul> <Li> Philosophy of war </Li> <Tr> <Td> Organization (show) <Ul> <Li> Command and control </Li> <Li> Doctrine </Li> <Li> Education and training </Li> <Li> Engineers </Li> <Li> Intelligence </Li> <Li> Ranks </Li> <Li> Staff </Li> <Li> Technology and equipment </Li> </Ul> </Td> </Tr>

What was the reserve trench used for in ww1