@Driven
I read Joel a couple times- had to get it firmly in my head.
I found Joel 2v11 very interesting :
Jehovah will raise his voice before his army, for his camp is very numerous. For the one carrying out His word is mighty; for the day of Jehovah is great and very awe-inspiring. Who can endure it?”
Jehovah commands this northern army, like a marionette (if you will), it doing whatever He commands whenever and however He commands.
This would very well include any army of spirit beings as well as human beings- but as you mentioned, it IS a very VERY unique army, effective; successfully carries through every command from Jehovah, regardless of obstacle, because Jehovah himself commands it.