'Day of Battle' in the Bible

On the day of battle, none of the people who were with Saul and Jonathan were armed with swords or spears, but Saul and his son Jonathan did have them.

which I've reserved for the tribulation to come, for the day of battle and war?

The descendants of Ephraim were sharp shooters with the bow, but they retreated in the day of battle.

Your soldiers are willing volunteers on your day of battle; in majestic holiness, from the womb, from the dawn, the dew of your youth belongs to you.

The horse may be prepared for the day of battle, but to the LORD goes the victory.

Then the LORD will go out to battle against those nations, waging war as in a day of battle.