How did paintball start?

Paintball guns were originally invented for the logging industry to mark trees, and to mark cattle.

They were originally invented in the late 1970s. The very first paintball game was played in 1981 by twelve friends in a 100acre field in New Hampshire, USA, using Nelson brand industrial paintball guns and no safety equipment.

The first people to see the use of industrial marking paintball guns were Charles Gaines, Hayes Noel and Bob Gurnsey.
Paintball originally started to mark trees in the woods. The balls unlike today where much harder due to the fact that they where just suppose to break on trees. This later evolved into a game.