Polo is a team sport played on horseback. The objective is to score goals against an opposing team. Players score by driving a small white plastic or wooden ball into the opposing team’s goal using a long-handled mallet. The traditional sport of polo is played at speed on a large grass field up to 300 yards (274 meters) long by 160 yards (146 meters) wide, and each polo team consists of four riders and their mounts.

The oldest polo ground in the world is the Imphal Polo Ground in Manipur State. The history of this pologround is contained in the royal chronicle “Cheitharol Kumbaba” starting from AD 33. Lieutenant (later Major General) Joseph Ford Sherer, the father of modern polo visited the state and played on this polo ground in the 1850s. Lord Curzon, the Viceroy of India visited the state in 1901 and measured the polo ground as 225 by 110 yards (206 by 101 m).

source: https://en.wikipedia.org/wiki/Polo