I was trying to think what it sounded like last night - The Fourth of July.
Not quite a battle zone, though there were lots of explosions. More like being right in the middle of a storm cell that's stuck overhead, with the thunder and lightning crashing all around you. It went on for several hours.
Obviously, we the (rowdy, ragtag, rebellious) people missed the public fireworks displays - so we did our own!
You can catch a few seconds of it in the recording below. (Starts with a screech, then settles into a rumble.)