The first U.S. match known to have been inspired by FA rules was a game between Princeton and Rutgers in 1869, although the game included features such as extremely physical tackling and teams of 20 each. Other colleges emulated this development, but all of these were converted to rugby-oriented rules from soccer-oriented rules by the mid-1870s on, and they would soon become famous as early bastions of American football. (For more details see: History of American football and 1869 college football season.)