sentences:  The Ming dynasty had in the past dispatched work crews to salvage cannons from European shipwrecks and reverse engineer them.On 12 January 1662, Koxinga's fleet initiated another bombardment, while the ground force prepared to assault the fort.With supplies dwindling and no sign of reinforcement, Coyett finally ordered the hoisting of the white flag and negotiated terms of surrender, a process that was finalized on February 1.