how the US/allies fought back against U-boats:
speed was a big thing that was important
german ppl in france transmitted info to U-boats; this helped us because we could avoid them; interception of radio chatter
convoy system- travelling in large groups
using ultra we were able to avoid them
depth charge- like a bomb that you put under water
allied intelligence gathered:
we were able to intercept radio chatter from germany and eventually japan
HF/DF- dectected submarines from under the surface
ultra- desiphering german code; ultra: german code; magic: Japanese code
one of the reasons we won the war
we knew where the enemy was
the enigma- system where germany transferred their info through codes
bombe- the machine that desiphered the code
operation barbarossa:
hitler wanted the soviet union to achieve lebensraum
he invaded the soviet union because the despised ethnic slavs, wanted ukraine for farmland, could use people as slave labor, defeat the USSR would further isolate the allies
was the largest battle in world history
happened on june 22, 1941
had the most casualties
the soviet union marched the best of the german army(4.5 million)
by the end of the year 3,500,000 army soldiers were captivated and 4,000,000 died
German Wehrmacht: north: leningrad, center: moscow, south: stalingrad
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