Definitions for landwehr
that part of the army, in Germany and Austria, which has completed the usual military service and is exempt from duty in time of peace, except that it is called out occasionally for drill
The Nuttall Encyclopedia
a military force in Germany and Austria held in reserve against a time of war, when it is called out to do ordinary military duty. In Germany those capable of bearing arms have to serve in it five years after completing their seven years' term of regular service.