2 Chronicles 20:21 ESV
“…he (Jehosaphat) appointed those who were to sing to the Lord and praise him in holy attire, as they went before the army, and say, “Give thanks to the Lord, for his steadfast love endures forever.”

Understand this principle, Jehosaphat had singers go before the army to worship and thank God for victory before anyone had even engaged in battle. As you face you tough battles thank God, praise God in advance! He will give you the victory