And it came to pass in the days of Amraphel king of Shinar, Arioch king of Ellasar, Chedorlaomer king of Elam, and Tidal king of nations, that they made war with Bera king of Sodom, Birsha king of Gomorrah, Shinab king of Admah, Shemeber king of Zeboiim, and the king of Bela (that is, Zoar).
Genesis 14:1-2

And he said to his people, "Look, the people of the children of Israel [are] more and mightier than we; come, let us deal shrewdly with them, lest they multiply, and it happen, in the event of war, that they also join our enemies and fight against us, and [so] go up out of the land."
Exodus 1:9-10

Then it came to pass, when Pharaoh had let the people go, that God did not lead them [by] way of the land of the Philistines, although that [was] near; for God said, "Lest perhaps the people change their minds when they see war, and return to Egypt." So God led the people around [by] way of the wilderness of the Red Sea. And the children of Israel went up in orderly ranks out of the land of Egypt.
Exodus 13:17-18

The LORD [is] a man of war; The LORD [is] His name.
Exodus 15:3

For he said, Because the LORD hath sworn [that] the LORD [will have] war with Amalek from generation to generation.
Exodus 17:16

And when Joshua heard the noise of the people as they shouted, he said unto Moses, [There is] a noise of war in the camp.
Exodus 32:17

From twenty years old and upward, all that are able to go forth to war in Israel: thou and Aaron shall number them by their armies. . . And the children of Reuben, Israel's eldest son, by their generations, after their families, by the house of their fathers, according to the number of the names, by their polls, every male from twenty years old and upward, all that were able to go forth to war; Those that were numbered of them, [even] of the tribe of Reuben, [were] forty and six thousand and five hundred.

Of the children of Simeon, by their generations, after their families, by the house of their fathers, those that were numbered of them, according to the number of the names, by their polls, every male from twenty years old and upward, all that were able to go forth to war; Those that were numbered of them, [even] of the tribe of Simeon, [were] fifty and nine thousand and three hundred.

Of the children of Gad, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war; Those that were numbered of them, [even] of the tribe of Gad, [were] forty and five thousand six hundred and fifty.

Of the children of Judah, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war; Those that were numbered of them, [even] of the tribe of Judah, [were] threescore and fourteen thousand and six hundred.

Of the children of Issachar, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war; Those that were numbered of them, [even] of the tribe of Issachar, [were] fifty and four thousand and four hundred.

Of the children of Zebulun, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war; Those that were numbered of them, [even] of the tribe of Zebulun, [were] fifty and seven thousand and four hundred.

Of the children of Joseph, [namely], of the children of Ephraim, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war; Those that were numbered of them, [even] of the tribe of Ephraim, [were] forty thousand and five hundred.

Of the children of Manasseh, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war; Those that were numbered of them, [even] of the tribe of Manasseh, [were] thirty and two thousand and two hundred.

Of the children of Benjamin, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war; Those that were numbered of them, [even] of the tribe of Benjamin, [were] thirty and five thousand and four hundred.

Of the children of Dan, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war; Those that were numbered of them, [even] of the tribe of Dan, [were] threescore and two thousand and seven hundred.

Of the children of Asher, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war; Those that were numbered of them, [even] of the tribe of Asher, [were] forty and one thousand and five hundred.

Of the children of Naphtali, throughout their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war; Those that were numbered of them, [even] of the tribe of Naphtali, [were] fifty and three thousand and four hundred.

These [are] those that were numbered, which Moses and Aaron numbered, and the princes of Israel, [being] twelve men: each one was for the house of his fathers. So were all those that were numbered of the children of Israel, by the house of their fathers, from twenty years old and upward, all that were able to go forth to war in Israel; Even all they that were numbered were six hundred thousand and three thousand and five hundred and fifty.
Numbers 1:3, 20-46

"When you go to war in your land against the enemy who oppresses you, then you shall sound an alarm with the trumpets, and you will be remembered before the LORD your God, and you will be saved from your enemies.
Numbers 10:9

So Moses spoke to the people, saying, "Arm some of yourselves for war, and let them go against the Midianites to take vengeance for the LORD on Midian. A thousand from each tribe of all the tribes of Israel you shall send to the war." So there were recruited from the divisions of Israel one thousand from [each] tribe, twelve thousand armed for war.

Then Moses sent them to the war, one thousand from [each] tribe; he sent them to the war with Phinehas the son of Eleazar the priest, with the holy articles and the signal trumpets in his hand. And they warred against the Midianites, just as the LORD commanded Moses, and they killed all the males. They killed the kings of Midian with [the rest of] those who were killed--Evi, Rekem, Zur, Hur, and Reba, the five kings of Midian. Balaam the son of Beor they also killed with the sword. . . But Moses was angry with the officers of the army, [with] the captains over thousands and captains over hundreds, who had come from the battle. . . And levy a tribute for the LORD on the men of war who went out to battle: one of every five hundred of the persons, the cattle, the donkeys, and the sheep. . . The booty remaining from the plunder, which the men of war had taken, was six hundred and seventy-five thousand sheep...

Then the officers who [were] over thousands of the army, the captains of thousands and captains of hundreds, came near to Moses; and they said to Moses, "Your servants have taken a count of the men of war who [are] under our command, and not a man of us is missing. . . (The men of war had taken spoil, every man for himself.)
Numbers 31:3-8, 14, 28, 32, 48-49, 53

And ye shall hear of wars and rumours of wars: see that ye be not troubled: for all these things must come to pass, but the end is not yet. For nation shall rise against nation, and kingdom against kingdom: and there shall be famines, and pestilences, and earthquakes, in divers places. All these are the beginning of sorrows.
Matthew 24:6-8

For though we walk in the flesh, we do not war after the flesh...
2 Corinthians 10:3

Where do wars and fights come from among you? Do they not come from your desires for pleasure that war in your members? You lust and do not have. You murder and covet and cannot obtain. You fight and war. Yet [fn] you do not have because you do not ask.
James 4:1-2

Beloved, I beg [you] as sojourners and pilgrims, abstain from fleshly lusts which war against the soul...
1 Peter 2:11

And I saw heaven opened, and behold a white horse; and he that sat upon him [was] called Faithful and True, and in righteousness he doth judge and make war. . . And I saw the beast, and the kings of the earth, and their armies, gathered together to make war against him that sat on the horse, and against his army.
Revelation 19:11, 19

And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels, And prevailed not; neither was their place found any more in heaven. And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him. And I heard a loud voice saying in heaven, Now is come salvation, and strength, and the kingdom of our God, and the power of his Christ: for the accuser of our brethren is cast down, which accused them before our God day and night. And they overcame him by the blood of the Lamb, and by the word of their testimony; and they loved not their lives unto the death.
Revelation 12:7-11