What is the Aryan invasion theory?

Aryans were quietly peaceful, however if they need to battle (mostly for defense), they battle with the enemy's army and not with the people and never take spoil or destroy the cities and even sometimes did not change the ruler of the enemy's country.

they believed in good deeds, good thought and good speech (word).

New Archaelogical findinds have buried this theory of aryan Invasion.There was never an invasion of aryans. They were natives of India some 1500 B.C.Max Muller and british propagated this lie to show superiority of European race...