The Formosa Expedition was a punitive expedition launched by the United States against the Paiwan, an indigenous Taiwanese tribe. The expedition was undertaken in retaliation for the Rover incident, in which the Rover, an American bark, was wrecked and its crew massacred by Paiwan warriors in March 1867. A United States Navy and Marine company landed in southern Taiwan and attempted to advance into the Paiwan village. The Paiwan responded with guerrilla warfare, repeatedly ambushing, skirmishing, disengaging and retreating. Eventually, the Marines' commander was killed and they retreated to their ship due to fatigue and heat exhaustion, and the Paiwan dispersed and retreated into the jungle. The action is regarded as an American failure.