EQUIPPED FOR BATTLE
Finally, my brethren, be strong in the Lord and in the power of His might. Put on the whole armor of God, that you may be able to stand against the schemes of the devil. For we do not wrestle against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this age, against spiritual hosts of wickedness in the heavenly places. Ephesians 6:10-12
Satan is a fallen angel, formerly known as Lucifer, also called the "Prince of the power of the air" among other things to profane to mention, nonetheless he and one third of God's holy angels made the fatal decision to follow after him in a war that ended in their expulsion from Heaven!
A principality is a prince over a territory, an angelic host assigned to a certain area to rob, kill and destroy. You have felt their influence driving through different parts of your city or cities, such as Las Vegas for instance, deemed "Sin City!" Although we speak of Satan and his demons, scripture describes him as the devil and his angels, for instance, God created Hell for the devil and his angels, not he and his demons.
The word says that dealing with a principality is reserved for the church and I believe it is because of the counter attack that comes from engaging with them! We must use wisdom in dealing with the angelic forces of evil even though we have all power and authority over them because of their experience in deceiving mankind for eons!
Therefore take up the whole armor of God, that you may be able to withstand in the evil day, (counter attack) having done all, to stand. Ephesians 6:13
Your servant in Christ, Timothy Laughlin