It was in 1576, when Philippine governor Fransisco de Sande took up the cause, that the pressure to launch an expedition ratcheted into high gear and led to the creation of an elaborate and more realistic—albeit still fantastic—plan. In a dispatch to Madrid dated June 7, de Sande estimated that four to six thousand well-armed Spaniards would be needed to accomplish the task, plus some Japanese and Chinese pirates who would join the enterprise, presumably lured by the prospect of booty. They would sail to the southern Chinese coast, only a two-day journey from northern Luzon, aboard a fleet of galleys built locally using the trees that grew so plentifully on the island. Once there, a force of two or three thousand men would storm ashore and seize one Chinese province. “This will be very easy,” de Sande assured the king, for the people “generally have no weapons, nor do they use any. A corsair with two hundred men could rob a large town of thirty thousand inhabitants. They are very poor marksmen, and their arquebuses are worthless.” After that, all the other provinces would fall to the invaders, for the Chinese were a downtrodden people and would take the opportunity of the Spanish conquest to revolt against the Ming. “[F]inally,” de Sande concluded, “the kind treatment, the evidences of power, and the religion which we shall show to them will hold them firmly to us.”[9]
-http://www.samuelhawley.com/imjinarticle3.htmlGovernor de Sande, like de Rada and de Artieda before him, did not receive approval from Madrid to go ahead with his plan.
Even though it's extremely unlikely, what if Philip agrees to this and Spain invades China in the late 1570s? What would be the impacts in either Ming China or Spain?
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