What technology made trench warfare obsolete?

Trench fighting is a static method for battling and depends upon the way that the two adversaries confront each other involving settled position and assaulting each other from these positions attempting to dispense whatever number losses as could be expected under the circumstances to the foe without extremely thinking about regional gain. The clash of Verdun amid WWI is an exemplary case of this thought; the fight was a \"meat grinder\" where regional gain was even disheartened!