Before the fifteenth century, the main source of power for warships of various countries was the use of sails and oars.

That is, there are both sails and oars.

Sails are used when there is wind, and oars are used when there is no wind.

Between the fifteenth and sixteenth centuries, human knowledge of the ocean began to increase.

They found that there was basically no wind at sea, and even if there was no wind, the warship could sail with the help of ocean currents.

As a result, warships of various countries gradually abandoned oars and used sails as the power of warships.

By the mid-seventeenth century, warships that used only sails as power became mainstream

"Da Ming: Crossing Emperor Chongzhen, Opening a Rope" Chapter 718 Deep Sea Fierce Battle is in the middle of a hand-to-hand fight, please wait a moment,

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