What is significant about the Battle of Tsushima?

It was the first battle fought entirely at sea.
It ended with Russia destroying all of Japan’s navy.
It had the first use of radio communication in battle.
It began with a secret attack on Russian ships.

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Answer:

It was the first major battle of the 20th century, and the Russian fleet was decimated.  During the subsequent war, Japan won a series of decisive victories over the Russians, who underestimated the military potential of its non-Western opponent

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