Valhalla
Near my parents first house was a graveyard named Valhalla. We used to play there, because half of the graveyard was undeveloped, meaning that in the back was a woods with a swamp.
We would play things like “Vietnam”. We would spit into 2 groups and conduct pre-teen guerrilla warfare on each other, in the summer we would use bottle rockets to simulate mortars and smoke grenades for cover, etc. We would dig elaborate pit traps. We stopped hiding under water in the swamp pretty fast, because of the leeches we found ourselves covered in.