rugby football is a very violent game!
Rugby is a very old game that can be traced all the way the Greek and Romans.
Wow!   What was the ball made from back then?
My guess out of the some kind of animal hide.   Rugby is still favorite game in English public school. 
What are some of the positions called?
You got the kickers and the defenders.  There are different variations of football know as football codes.
what are some of those codes?
Football in Australia
Football in Australia refers to football codes played in the country including Australian rules football, rugby league, rugby union, association football (soccer), American football and Gaelic football. Professional football is played in Australia for four of these codes, with the leagues involved including the Australian Football League (Aussie rules), the National Rugby League (Rugby League), Super Rugby (rugby union), and the A-League (soccer). Professional football has been televised for many years, with Australian
century and these were subsequently very influential in the formulation of the 1863 first ever rules of modern Association Football by the Football Association. Many English public school football games involved dribbling and players were often very skillful at this art. Passing was certainly part of some games, as can be seen in the game of rugby football. The value of passing the ball in these various games depended upon the offside rule in that particular code. Some public school games kept a very tight offside rule, thus making forward passing worthless. Some