How effective was the Philippine guerrillas during WW2?

People generally know that my homeland, the Philippines was invaded during the 2nd World War by Japan. It had been discussed in my history classes that pockets of guerrilla forces were formed/emerged after the surrender, comprising of former Philippine Army personnel and normal people, especially farmers. However, they did not clearly stated how effective and useful were these forces. Mr. Indy and crew, including all TimeGhost Army members, How effective, do you think, was the Philippine gerrillas during the war?