If you are in God wait for victory

21 And there was counsel with the people, and he appointed some to sing and praise Jehovah, clothed in sacred ornaments, while the armed men went forth, and to say, Praise the Lord, for his mercy endureth for ever.

22 And when they began to sing songs of praise, Jehovah set the ambushes of themselves against the children of Ammon, of Moab, and of mount Seir, which came against Judah, and slew one another.

Source

All of us have been subjected to a battle in this world, and we are day by day exposed to deliver them. Our battles are more spiritual than carnal.
The apostle Paul teaches us in the book of Ephesians 6: 10-20 how to stand firm and emerge victorious from the spiritual battle we face in deciding to live according to our identity.
The battle is related to victory, because the end of each battle is to achieve victory.
Victory is a term originally applied to war, given the success achieved in personal combat in any competition.

These verses reveal the third key to the miraculous salvation of Judah and it is praise (the name Judah means praise). and when they began to sing songs of praise to God in the hope that He would fight for them the battle, their enemies killed each other. Experiences like these are narrated in other passages. For example, Psalm 22.3 says that God is glorified in the praises of his people. Wherever and how the people of God praise the Lord. He reigns among them and does miraculous things for them.
This is a promise. However, the question would be: where do you have your eyes today? - That question is very important in the Christian people, because to obtain victory it is necessary that there be faith. In addition to looking at things not with personal logic, not with our incapacity, but with the capacity of God.
We must understand that God is capable of resolving any situation and giving us victory.

God's response to our inability and our fears will always be trustworthy, for God is constantly telling us: "do not fear."
We can read that God's response in this text is the same as yesterday's "do not fear" or be cowed by this great multitude that you see physically because the battle they are fighting is not yours, it is mine. In other words, the battles that we face every day, we do not fight alone, or with our strength, or with our weaknesses, we fight with God. He fights for us.

Faith is rooted in the testimony of God in scripture as communicated to us by the Holy Spirit, so we must believe and receive with faith what the scriptures offer us.
Praise to God breaks ties and liberates. For this reason we can see in this text that after praising God, the great victory is granted.

¡The miracle of victory is given at the moment they began to sing praises to God!

In praise to God there is victory

Source

In addition, the call is to trust in God at all times because He himself will fight for his people.