The Soviets used Using their air power to deal Resolve_problem harshly with both rebels Hostile_encounter and civilians , levelling Cause_change_of_position_on_a_scale villages to deny safe haven to the mujahideen , destroying Destroying vital irrigation ditches , and laying Placing millions of land mines .

The Ottomans wintered there until 1535 , overseeing Scrutiny the reconstruction Building of Sunni and Shia religious shrines and agricultural irrigation projects .

The irrigation systems in the Imperial Valley were badly affected Influence , but no deaths Death occurred .