towards its tip. This moves the centre of gravity as far forward as possible, giving the bolo extra momentum for chopping. So-called "jungle bolos", intended for combat rather than agricultural work, tend to be longer and less wide at the tip. Bolos for gardening usually have rounded tips. Types The term "bolo" has also expanded to include other traditional blades that primarily or secondarily function as agricultural implements. They include: Barong - a leaf-shaped sword or knife favored by the Tausug people. Batangas - a single-edged bolo of the Tagalog people that widens at the tip. Garab - a sickle used for harvesting rice. Guna or Bolo-guna - A weeding knife with a very short, wide, dull blade and a perpendicular blunt end. It is used mainly for digging roots and weeding gardens. Kampilan - a tapering longsword found throughout the Philippines. Iták - a narrow sword used for combat and self-defense in the Tagalog regions. Like the súndang, it is also known as the "jungle bolo" or "tip bolo", and was a popular weapon during the Philippine Revolution and the Philippine-American War. Haras - a scythe used for cutting tall grass. It is called "Lampas" by people from Mindanao. Pinutî - a narrow sword traditionally carried as a personal weapon for combat or self-defense. Pirah or Pira - a wide-tipped sword or knife favored by the Yakan people, it is also common in the Sulu Archipelago, Mindanao, and the Visayas. Punyál or Gunong - a dagger derivative of the kalis. Used as a side-weapon in combat, or to kill and bleed pigs during slaughter. Also known under the more generic term kutsilyo (Spanish cuchillo, "knife"). Súndang - the most common personal weapon used for combat and self-defense in the Visayas. Also known as the "jungle bolo" or "tip bolo". It was a popular weapon of choice in the Philippine Revolution against the Spanish Empire and during the subsequent Philippine–American War. Binangon - A form of súndang used in Western Visayas and Negros Island. Historical significance The bolo was the primary weapon used by the Katipunan during the Philippine Revolution. It was also used by the Filipino guerrillas and bolomen during the Philippine–American War. During World War I, United States Army soldier Henry Johnson gained international fame repelling a German raid in hand-to-hand combat using a bolo. During World War II, members of the 1st Filipino Regiment and the 81st