Great britain’s success in the battle of britain and the soviet defense of russia proved that hitler’s army could be

defeated

Explanation:

The Battle for Britain was in part a result from Churchill standing firm against the attempt by the German Luftwaffe to bring down the city of London into ashes.

The royal airforce was able to dismantle any attempt of enemy to land ground forces into mainland Britain.

The city inhabitants were high in moral and supported the Air raids.

Soviet defense of Russia

Mainly from the Battle of Stalingrad and onwards, Soviet military regained moral.

Germans suffered from the harsh winter Campaign conditions and never had a chance to recover, too many casualities on the Eastern Front due to Soviet increased and evolved tactict outruned the German initial succes.

Stalin began to modernize the military and quickly saw the war as the best instrument for communist ideology to further settle in the territories that were taken back from the Germans along the Eastern Front.

Both cases proved Hitler's army could be defeated.

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