The massive assault on the Philippine island of Mindanao began with naval and air bombardments along the beach defenses east of Zamboanga City , forcing the enemy to evacuate these excellent defensive positions .
Zamboanga , and the Sulu Archipelago .
The massive assault on the Philippine island of Mindanao began with naval and air bombardments along the beach defenses east of Zamboanga   , forcing the enemy to evacuate these excellent defensive positions .
Zamboanga , and the Sulu Archipelago .