The other spiritual kings and generals and their spiritual hierarchies are destroyed. John says that they are destroyed by the sword that comes out of Jesus mouth.
The rest were killed with the sword coming out of the mouth of the rider on the horse, and all the birds gorged themselves on their flesh (Rev 19:21).
The sword is the word of God. The spiritual powers of evil were created by a word from God’s mouth as part of the creation of the world. These ruler spirits who are expert in controlling government and fighting wars will be destroyed by a word spoken by Jesus.
Evil spirits love the destruction of war. Many governing spirits will have gathered so they can expand their power, but many ordinary spirits show up because they love the blood and death that war creates. They are the ones that John called the birds of the air (Luke 8:5,11). When the power spirits are killed, they gorge on their power. John described this as a “supper”.
This spiritual battle will be an enormous victory for God, because the destruction of the ruling spirits will dramatically weaken the strength of the spiritual powers of evil. This is a significant change in the balance of power on earth.
The total number of evil spirits in existence might be reduced to a quarter of what they have been. A third of angels fell, so their number was about half the number of the good angels. The destruction of this great battle will mean the angels outnumber them at least ten to one.
With a large population of people on earth, the remaining evil spirits will be spread very thin and find it harder to harass God’s people. This victory will bring a period of peace and blessing on earth.
All the spirits that have skills in controlling governments and armies will be gone. This will dramatically weaken the power of human government’s. The collapse of human governments will open the way for the Government of God
How does this happen? The prophets will be the key. In Revelation 10, John described a powerful prophetic voice that emerges in the church. These prophets will pronounce declarative prayers against the spiritual powers of evil, which will release the Holy Spirit and the angelic armies. This massive spiritual power will destroy the enemies of God.