1904 In February, during the Russo-Japanese War, the Japanese navy could not see the Russian warships moored in Lushun Port from the far sea, so it could not attack, so it tried to shell the inner channel by indirect shooting.

To this end, the Japanese navy sent a small drive.

One ship after another, observe the impact point in a favorable place near the coast for calibration, and then transmit the correct shooting instructions to the armored cruisers through radio communication in an attempt to deal a devastating blow to Russian warships in one fell swoop.

Unexpectedly, an ordinary operator at the Russian base destroyed their wishful thinking. When the Russian operator heard the information exchange between Japanese ships, he immediately realized its importance. He instinctively pressed the button of the spark transmitter of the radio communication equipment at that time, which interfered with the communication between Japanese ships. As a result, in the naval battle that day, almost no Russian warships were damaged because the correct shooting instructions of the Japanese navy were disturbed.

The earliest electronic warfare in human history has thus stepped onto the stage of war.