If we take 10th class tb u will get an idea about the hitker attak on the SU .
im the year 1919 the the hitler lost his germany lands he want to get his lands back to hus control in 19th century  the hitler was people men, when coming to second world war he be  became like kanjus he want to rule over all the world his idea is take the world into his control but his bad luck again he lose in second world war  and all people became reverse to hitler and he left his country and he ran of from his country investigation are taking on till now in this world if want to seego to the HISTORY channel you will get an idea about why he attack on the soviet union clearly, so plz watch history channel.