'Warfare' in the Bible

Who goeth a warfare any time at his own charges? who planteth a vineyard, and eateth not of the fruit thereof? or who feedeth a flock, and eateth not of the milk of the flock?

For though we walk in the flesh [as mortal men], we are not carrying on our [spiritual] warfare according to the flesh and using the weapons of man.

(For the weapons of our warfare are not carnal, but mighty through God to the pulling down of strong holds;)

For ours is not a conflict with mere flesh and blood, but with the despotisms, the empires, the forces that control and govern this dark world--the spiritual hosts of evil arrayed against us in the heavenly warfare.

This charge I commit unto thee, son Timothy, according to the prophecies which went before on thee, that thou by them mightest war a good warfare;

and to [your wife] Apphia our sister, and to Archippus our fellow soldier [in ministry], and to the church that meets in your house: