Reasons of Great Patriotic war

the German nation (the idea of ​​Pan-German)
Need for conquest fascist

Germany of natural resources of the USSR, it needs to continue the war against Britain and the U.S.
Fatal ideological contradictions between the capitalist and socialist systems

aerial bombardment and the onset of the German Army launched

a plan "Barbarossa" . It was designed for Blitzkrieg
( Blitzkrieg ) and involves the joint action of three army groups (GA ) : "North " was aimed at Leningrad ; "Center" - to Moscow ; "South" - to Ukraine. By September, the enemy had to go on line Arkhangelsk- Astrakhan. Plan " Barb Arossim "was part of a global plan " Ost " , provides for the phased establishment on the territory of the former USSR " new order " , ie enslavement and partial destruction of the Soviet populatin .

war:
military and economic potential of Germany, to use the resources

of almost all Western Europe, greatly exceeded the capacity of industry in the USSR;
Hitler's army had two years' experience of modern warfare, while the professional level of the Soviet troops, particularly commanders, after the mass repressions in the army, was low;
major flaws of the Soviet leadership: underestimation of mechanized formations, outdated ideas about methods of warfare;
Stalin's intervention in the command and control, in particular - the order of the transition to the offensive in the first days of the war, which cost the Soviet Army and the huge losses led to its disruption;
miscalculations Stalin and his entourage in the analysis of the international situation, in determining the timing of a possible outbreak of the war that led to the surprise attack of the enemy.

Soviet soldiers.
From the first day of the war more than

a month defended border defenders of the Brest Fortress .
June 26 crew accomplished the feat Nikolai Gastello sent his crippled bomber on a column of tanks .
These and many other manifestations of courage Soviet soldiers dreaded enemy , deprived of his faith in victory.
Soviet generals acquired combat experience necessary to confront the latest tactics of the enemy.
Appearance on the battlefield the latest models of Soviet military equipment , vehicles surpassed the enemy ( KV- 1 and T- 34, Il-2 , rocket launcher "Katyusha" ) .
Complex natural and climatic conditions of the western and southwestern regions of the USSR ( the summer heat , dust , autumn slush ) . Geography ( a huge area of the country ) .