My day was made around 11 AM this morning:
You can argue, correctly in my opinion, that it wasn't a game.
There were no rules, there were no randomizers, there was no doubt as to the outcome. If anything, it was more like a proto-wargame. I like to imagine him as H.G. Wells toying about with that cannon before coming up with Little Wars.
So, yeah, my two-year old son played with "toy soldiers" for the first time. I could not have been more ecstatic!