'Warfare' in the Bible

and he gave orders to teach the descendants of Judah the art of warfare, as is recorded in the Book of Jashar:

How [the] mighty have fallen and the weapons of warfare perished."

And David saith unto the messenger, 'Thus dost thou say unto Joab, Let not this thing be evil in thine eyes; for thus and thus doth the sword devour; strengthen thy warfare against the city, and throw it down -- and strengthen thou him.'

Moreover, Hushai said, “You know your father and his men, that they are mighty men and they are fierce, like a bear robbed of her cubs in the field. And your father is an expert in warfare, and will not spend the night with the people.