Many give credit to Gary Gygax, few know of Dave Arneson or even David Wesely and their Major contribution to the creation of the game Dungeons & Dragons. They in fact were the driving force that created Role-playing games as we know them. They created the role of Dungeon Master, created the guidelines for Role-playing, and even added the elements of Fantasy, which mainly is credited to Arneson on that last bit.
Seeking help publishing Gygax with a push from Don Kayes asked Dave to bring his game over to Wisonsin to show off. Instead of just a night of gaming Gygax was hooked and played all weekend long. He realized what Dave Arneson had created was a hit.
Un able to recreate the exact method or rules Gygax agreed to some terms that eager Dave Arneson agreed to. Mostly because Dave Arneson was finally going to get published! 50/50 credit on all works, and 5% royalty..... Not the normal type of deal... And that deal did not stay.
AD&D dropped Arneson's name, and payments on royalties on all products stopped....
A sad story, but this is about the creative input that lead to our Role-playing games as we know them!
The Origin was not exactly in War Gaming, but gaming in general, with free flowing Role-playing. Wargaming aspects was reintroduced or even forced by others not aware of why the rules were light.... to keep it fun. A problem that later editions never realized.