They did not try to stop it due, to already bad relations with the soviets, plus if you look at a map of divided Germany you can see that they were deep into the soviets territory. <span />
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Your answer is wrong and I have no idea why your talking about feminism. But anyway the affect of surprise was that the natives Americans enemy wouldn't have time to prepare so the losses/casualties for the enemy would be heavy,also using the element of surprise would also most likely scare enemy soldiers, and they would be distracted and confused as well.