To prepare for war or combat is called:
Combat duty
The draft
Mobilization

what are local authorities doing to fix the problem

explanation: what are local authorities doing to fix the problem

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.