 The historians believe that the phalanx was created individually by military forces, but was so effective that others had to immediately adapt their way of war to combat the formation.Rapid Adoptionists propose that the double grip, hoplon shield that was required for the phalanx formation was so constricting in mobility that once it was introduced, dark age, free flowing warfare was inadequate to fight against the hoplites only escalating the speed of the transition.Quickly, the phalanx formation and hoplite armour became widely used throughout Ancient Greece.