<Dl> <Dt> European </Dt> </Dl> <Ul> <Li> Western Front </Li> <Li> Eastern Front </Li> <Li> Italian Front </Li> <Li> Balkans </Li> </Ul> <Dl> <Dt> Middle Eastern </Dt> </Dl> <Ul> <Li> Caucasus </Li> <Li> Persia </Li> <Li> Gallipoli </Li> <Li> Mesopotamia </Li> <Li> Sinai and Palestine </Li> <Li> Arab Revolt </Li> <Li> South Arabia </Li> </Ul>

When did the first and second world war happen