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 Zamboanga was immediately evacuated upon Koxinga's threats.
With no more torpedoes available for PT-41 to use, it was commandeered by the United States Army to patrol Lake Lanao, Mindanao.
In 1757, the Moros, more particularly, the Iranuns (a relative of the Maranaws of the Lake Lanao regions) organized a war fleet of 74 fast native ships called prahus they destroyed completely several settlements in the island, carrying off their inhabitants to be sold as slaves in the slave market in Jolo.
The park's location in the Lake Lanao-Agus River Watershed Area makes it an important site for conservation efforts.
The park covers the mountainous eastern section of Lanao del Sur near the Lake Lanao-Agus River Watershed Area known for its beautiful sparkling stream, virgin forest and invigorating climate.
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Lanao centers on the basin of Lake Lanao; thus, it is the land of the Maranaos, the "people of the lake."