Most of the passages I remember reading have to do with God punishing the Israelites as consequence for various acts committed on their way to the Promised land, but it seems that God did protect the Israelite army in their battles.
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Numbers 21
Arad Destroyed
1 When the Canaanite king of Arad, who lived in the Negev, heard that Israel was coming along the road to Atharim, he attacked the Israelites and captured some of them. 2 Then Israel made this vow to the LORD : "If you will deliver these people into our hands, we will totally destroy [a] their cities." 3 The LORD listened to Israel's plea and gave the Canaanites over to them. They completely destroyed them and their towns; so the place was named Hormah. [b]
The Bronze Snake
4 They traveled from Mount Hor along the route to the Red Sea, [c] to go around Edom. But the people grew impatient on the way; 5 they spoke against God and against Moses, and said, "Why have you brought us up out of Egypt to die in the desert? There is no bread! There is no water! And we detest this miserable food!"
6 Then the LORD sent venomous snakes among them; they bit the people and many Israelites died. 7 The people came to Moses and said, "We sinned when we spoke against the LORD and against you. Pray that the LORD will take the snakes away from us." So Moses prayed for the people.
8 The LORD said to Moses, "Make a snake and put it up on a pole; anyone who is bitten can look at it and live." 9 So Moses made a bronze snake and put it up on a pole. Then when anyone was bitten by a snake and looked at the bronze snake, he lived.
Numbers 25
Moab Seduces Israel
1 While Israel was staying in Shittim, the men began to indulge in sexual immorality with Moabite women, 2 who invited them to the sacrifices to their gods. The people ate and bowed down before these gods. 3 So Israel joined in worshiping the Baal of Peor. And the LORD's anger burned against them.
4 The LORD said to Moses, "Take all the leaders of these people, kill them and expose them in broad daylight before the LORD, so that the LORD's fierce anger may turn away from Israel."
5 So Moses said to Israel's judges, "Each of you must put to death those of your men who have joined in worshiping the Baal of Peor."
6 Then an Israelite man brought to his family a Midianite woman right before the eyes of Moses and the whole assembly of Israel while they were weeping at the entrance to the Tent of Meeting. 7 When Phinehas son of Eleazar, the son of Aaron, the priest, saw this, he left the assembly, took a spear in his hand 8 and followed the Israelite into the tent. He drove the spear through both of them—through the Israelite and into the woman's body. Then the plague against the Israelites was stopped; 9 but those who died in the plague numbered 24,000.
Numbers 26
The Second Census
8 The son of Pallu was Eliab, 9 and the sons of Eliab were Nemuel, Dathan and Abiram. The same Dathan and Abiram were the community officials who rebelled against Moses and Aaron and were among Korah's followers when they rebelled against the LORD. 10 The earth opened its mouth and swallowed them along with Korah, whose followers died when the fire devoured the 250 men. And they served as a warning sign. 11 The line of Korah, however, did not die out.
Numbers 31
Vengeance on the Midianites
48 Then the officers who were over the units of the army—the commanders of thousands and commanders of hundreds—went to Moses 49 and said to him, "Your servants have counted the soldiers under our command, and not one is missing. 50 So we have brought as an offering to the LORD the gold articles each of us acquired—armlets, bracelets, signet rings, earrings and necklaces—to make atonement for ourselves before the LORD."
hope this helps a bit.