'Day of Battle' in the Bible

So it came to pass in the day of battle, that there was neither sword nor spear found in the hand of any of the people who were with Saul and Jonathan: but with Saul and with Jonathan his son was there found.

which I have reserved against the time of trouble, against the day of battle and war?

The children of Ephraim, being armed and carrying bows, turned back in the day of battle.

LORD, the Lord, the strength of my salvation, you have covered my head in the day of battle.

The horse is prepared for the day of battle; but victory is with the LORD.

Therefore a battle roar will arise among your people, and all your fortresses will be destroyed, as Shalman destroyed Beth Arbel in the day of battle. The mother was dashed in pieces with her children.

But I will kindle a fire in the wall of Rabbah, and it will devour its palaces, with shouting in the day of battle, with a storm in the day of the whirlwind;

Then the LORD will go out and fight against those nations, as when he fought in the day of battle.