during the following centuries, "wakō" pirates actively plundered the coast of the chinese empire. though the term "wakō" translates directly to "japanese pirates", japanese were far from the only sailors to harass shipping and ports in china and other parts of asia in this period, and the term thus more accurately includes non-japanese pirates as well. the first raid by "wakō" on record occurred in the summer of 1223, on the south coast of goryeo. at the peak of "wakō" activity around the end of the 14th century, fleets of 300 to 500 ships, transporting several hundred horsemen and several thousand soldiers, would raid the coast of china. for the next half-century, sailing principally from iki island and tsushima, they engulfed coastal regions of the southern half of goryeo. between 1376 and 1385, no fewer than 174 instances of pirate raids were recorded in korea. however, when joseon dynasty was founded in korea, "wakō" took a massive hit in one of their main homeland of tsushima during the ōei invasion. the peak of "wakō" activity was during the 1550s, when tens of thousands of pirates raided the chinese coast in what is called the jiajing "wakō" raids, but the "wakō" at this time were mostly chinese. "wakō" piracy ended for the most part in the 1580s with its interdiction by toyotomi hideyoshi.