The battle is in the mind. The enemy will always try to attack you in your thoughts. That's why he's the accuser of the brethren. His main tactic is to accuse you, try to intimidate you, and move you off your ground.
If the enemy can mess with your head without you fighting back, he knows he can derail you and keep you out of the battle.
The devil is very interested in keeping you from walking out the plans God has for you, and messing with your head is one of his favorite tools.
It is vital that you guard your mind with the truth of God’s Word. You must stand firm. You must put on the helmet of salvation.
It can be helpful to imagine yourself putting on the helmet. Physically place your hands on your head and thank God for giving you protection for your mind. Lay your hands on your head and declare that you have the mind of Christ, that you will think His thoughts. Resist the enemy’s lies that he’s wanting you to partner with.
God has given you the gift of a sound mind. Thank Him for it and receive it by faith. Peace of mind, not anxiety, is a part of the normal Christian life. You do not have to lose the battle in your mind.
For God has not given us a spirit of fear, but of power and of love and of a sound mind. 2 Timothy 1:7 NKJV
This is the battle. And if you stand firm, you will win it!
Remember. When the enemy comes in like a flood, the Lord will raise you up!