Fear is the opposite of faith. Faith gives us courage even 'though war may rise against us.'

Psalm 27:1-3
The Lord is my light and my salvation;
Whom shall I fear?
The Lord is the strength of my life;
Of whom shall I be afraid?
When the wicked came against me
To eat up my flesh,
My enemies and foes,
They stumbled and fell.

Though an army may encamp against me,
My heart shall not fear;
Though war may rise against me,
In this I will be confident.
Bible Gateway link: Psalm 27:1-3