'Campaign' in the Bible

The Lord sent you on a campaign saying, 'Go and exterminate those sinful Amalekites! Fight against them until you have destroyed them.'

Then Saul said to Samuel, "But I have obeyed the Lord! I went on the campaign the Lord sent me on. I brought back King Agag of the Amalekites after exterminating the Amalekites.

The LORD said, "They'll hand you over." David and his men, about 600 strong, got up and left Keilah. They moved around wherever they could go. Saul was advised that David had escaped from Keilah, so he stopped the campaign.

Then Achish summoned David and told him, "As surely as the LORD lives, you are trustworthy, and it seems good to me for you to campaign with me as part of the army. Indeed, I've not found any evil in you from the time you came to me until now. But the leaders don't approve of you.