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What are the military uses of tides?
Tides are caused by the tidal force of the sun and the moon, which makes the sea water on the earth fluctuate periodically. It can not only generate electricity, fish, make salt, develop shipping and marine biological culture, but also have an important impact on many military operations. In history, there are many successful cases of using tidal laws to win.

1661April 2 1 day, Zheng Chenggong led 25,000 soldiers to set off from Jinmen Island, arrived at Penghu Islands, entered Taiwan Province Provincial Government and attacked Chiqian City. Zheng Chenggong's army abandoned the Dagang Waterway, which is wide and deep, convenient to enter and exit, but heavily guarded on the shore, and chose the Luermen Waterway. There are many shallow reefs in the Luermen waterway, which is not only narrow, but also blocked by the wrecked ship sunk by the Dutch army, so the Dutch army here is weak in defense. Zheng Chenggong led the army to take advantage of the widening and deepening of the high tide channel, unexpectedly, quickly passed through Humen in the lower reaches, landed in Heliao Port, and went straight to Chibi City, and landed successfully in one fell swoop.

1959, Germany laid mines to intercept British ships entering and leaving the English Channel at night. According to the accurate calculation of the magnitude and direction of tidal current change, the German army determined the depth and orientation of mine drifting, and achieved great results by using mine drifting tactics.