The reason why General Stahlberg was concerned about the Soviets reaching Berlin first was because he was worried about how they would treat Germans.
General Stahlberg wanted the Americans and the British to reach Berlin first because he was worried that the Soviets would be ruthless against the Germans.
His reasons for this was based on the fact that the German invasion of the Soviet Union was completely ruthless and so the Soviets might want to retaliate.
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