original_query: When and where did Wendell Fertig organize and command an American-Filipino guerrilla force during World War II?
query: When and where did Wendell Fertig organize and command an American-Filipino guerrilla force during World War II?
answer: Wendell Fertig organized and commanded an American-Filipino guerrilla force on the Japanese-occupied southern Philippine island of Mindanao during World War II, beginning in 1942.