Koxinga's threat to invade the islands and expel the Spanish was an important factor in the Spanish failure to conquer the Muslim Moro people in Mindanao. The threat of Chinese invasion forced the Spanish to withdraw their forces to Manila, leaving some troops in Jolo and by Lake Lanao to engage the Moro in protracted conflict, while their fort on Zamboanga in Mindanao was immediately evacuated following Koxinga's threats. The Spanish were also forced to permanently abandon their colony in the Maluku Islands (Moluccas) and withdraw their soldiers from there to Manila.