<P> The first line of this multi-ethnic army was based and consisted of: </P> <Ul> <Li> The so - called "common" army and "common" navy, where the language was German, and was 87% of the total army </Li> <Li> The Landwehr of the Austrian army </Li> <Li> The Royal Hungarian "honvédség", where the language was Hungarian and Croatian . </Li> </Ul> <Li> The so - called "common" army and "common" navy, where the language was German, and was 87% of the total army </Li> <Li> The Landwehr of the Austrian army </Li>

Where were the critical world war i battles fought