Why was Hitler Sucessful between 39-42- A new war tactic

 Hitler and the Nazi party was very successful in their campaign in Europe during 1939-42.

 Some reasons were the new war tactic of blitzkrieg or '"Lighting war". This new tactic was aimed to defeat its opponents very shortly. This tactic required the concentration of offensive weapons such as tanks and infantry, airpower was also a key part of this tactic. The goal was too drive forces through enemy defense with tanks and roam freely behind enemy lines causing the defense to be very confused. German air power prevented the enemy from resupplying their troops. The troops would now be encircled by enemy troops and forced to surrender or left to die. This war tactic was very effective during Germans campaign because many troops were ordered not to retreat, enabling the encirclement to be easier.