Rules of Football that have developed between each school, these are two of them.
Cambridge's Rules
Cambridge decided that goals would be awarded for balls kicked between the flag posts (uprights) and under the string (crossbar). All players were allowed to catch the ball direct from the foot, provided the catcher kicked it immediately. However, they were forbidden to catch the ball and run with it. Only the goalkeeper was allowed to hold the ball. He could also punch it from anywhere in his own half. Goal kicks and throw-ins took place when the ball went out of play. It was specified that throw-ins were taken with one hand only. It was also decided that players in the same team should wear the same colour cap (red and dark blue).
Sheffield's Rules
1. The kick off from the middle must be a place kick.
2. Kick Out must not be from more than twenty-five yards out of goal.
3. Fair catch is a catch direct from the foot of the opposite side and entitles a free kick.
4. Charging is fair in case of a place kick (with the exception of a kick off as soon as a player offers to kick) but he may always draw back unless he has actually touched the ball with his foot.
5. No pushing with the hands or hacking, or tripping up is fair under any circumstances whatsoever.
6. Knocking or pushing on the ball is altogether disallowed. The side breaking the rule forfeits a free kick to the opposite side.
7. No player may be held or pulled over.
8. It is not lawful to take the ball off the ground (except in touch) for any purpose whatever.
9. If the ball be bouncing it may be stopped by the hand, not pushed or hit, but if the ball is rolling it may not be stopped except by the foot.
10. No goal may be kicked from touch, nor by a free kick from a fair catch.
11. A ball in touch is dead, consequently the side that touches it down must bring it to the edge of the touch and throw it straight out from touch.
12. Each player must provide himself with a red and dark blue flannel cap, one colour to be worn by each side.
From what I can see when Cambridge developed their first set of rules in 1848 from a meeting took place at Cambridge University. There were many teachers representing Shrewsbury, Eton, Harrow, Rugby, Marlborough and Westminster, is that the rules were relatively simple, however I think these rules were probably much too simple and I would think many fights would break out arguing whether or not if the during the game if you were able to hack somebody down would the opposing team get a free kick or a penalty. Also what was to stop all the players from charging at the ball and pushing people out of the way? It would seem that there is no such thing known as being offside. I personally would think the injury or even death rates would be exceptionally high. However ten years later Sheffield came up with new and much much more civilized rules that make a great deal more sense. I would think that this would cut down the injury rates by more than half, as well as the number fights that used to break out at almost every match. Even so both these sets rules had at least one thing in common. They had both decided on how to separate each of the teams, one team in red the other in blue. Never the less I do wonder who ensured that no one broke these rules as I find that referees weren't fabricated until later in the 19th century.