I remember we would have a lot of arguments about who and when one was shot and who and when one really wasn't.
In my neighborhood, we were expected to "take your deads," meaning we were supposed to fall down and writhe around in great agony for awhile. Only sissies didn't "take their deads."
We played "army" mostly with sticks but there was the one lucky kid who got a popgun for Christmas and was the envy of the crowd. He quickly learned it would shoot dirt clods out if you stuffed them in there. Dirt clods also became known as dirt "bombs" and were used in a similar fashion as grenades.
You didn't grow up in a Columbus suburb did you? That's, to the letter, exactly what we used to do. All the plastic guns got broken quickly, but one of us had this beautiful lever action metal popgun. Bombs were seasonal though, depending on what was available--acorns, dirt clods, and very briefly pine cones until someone's older brother taught us how to make a really mean snowball with ice in it. Really though, I think we spent most of our army time in the woods building forts, trenches, those holes covered with leaves that only work in cartoons, and sniper nests as far as we could climb in a tree.
Worst injury was when one kicked got poked in the eye by another kid's bayonet (stick). Now, the actual injury ended up being just a cut near the eye, but when you're that young "poking an eye out" is just about the worst possible injury you could possibly imagine. We were all afraid our mothers were right and he'd have to walk around with a glass eye for the rest of his life.
Now, the best times were when someone's dad bought or showed him something new. The level-action was a big hit, and when somebody's dad came home from the surplus store with a stick of camo paint, we were in heaven for the three days until it ran out.
Of course, this was a long time ago, in a suburb that's grown exponentially. The woods we used to play in were basically a huge undeveloped area between two neighborhoods. I went back a few years ago, and instead of two neighborhoods with a nice free zone, you've got one absolutely gigantic neighborhood.