What was the significance of the Battle of Tannenberg in World War I?

a.) The incoming British military forces amply supplied the Allied lines to prevent Germany from invading Paris.
b.)The attack on civilians by German war boats during the battle led to the United States entering the war.
c.)The defeat of British forces shifted the Allied war focus to defeating the Ottoman Empire.
d.)The failed Russian offensive into German territory represented the ineffectiveness of the Russian military.
D?

Yes, d.

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Yes, the correct answer is D) The failed Russian offensive into German territory represented the ineffectiveness of the Russian military.

The Battle of Tannenberg was a significant event in World War I that took place between August 26 and August 30, 1914, on the Eastern Front between Germany and Russia. It resulted in a major German victory over the Russian Empire.

To get to the answer, one can analyze the given options and understand their historical context. Option A talks about British military forces supplying the Allied lines to prevent Germany from invading Paris. While this may have happened during the war, it is not directly related to the significance of the Battle of Tannenberg.

Option B states that the attack on civilians by German war boats during the battle led to the United States entering the war. This is not accurate historically. The United States entered World War I in April 1917, well after the Battle of Tannenberg took place.

Option C mentions that the defeat of British forces shifted the Allied war focus to defeating the Ottoman Empire. However, the Battle of Tannenberg did not involve British forces or have any direct impact on the war in the Ottoman Empire.

Therefore, option D is the correct answer. The failed Russian offensive into German territory at the Battle of Tannenberg revealed the shortcomings and ineffectiveness of the Russian military, which had significant consequences for the Eastern Front and the overall war.