Soliders must Depend on God (Heinrich Bullinger)

But, above all things, let him not forget or think scorn, both in peril and out of peril, evermore to make his prayers and supplications to God his Saviour. In God's name let him begin all things; without God let him attempt nothing: in adversity, and when he hath the overthrow, let not his courage quail, nor his heart and hope forsake him; in prosperity let him not be puffed up with pride and arrogancy, but let him give thanks to God, and use the conquest like a merciful victor: let him wholly depend upon God's helping hand, and desire nothing rather than the defence of the commonweal, laws, religion, justice, and guiltless people.

-- Heinrich Bullinger, Protestant Reformer (1504-1575). Read more here

  

God is the Ultimate Ally (Joshua 21:44)

Joshua 21

King James Version (KJV)

44 And the Lord gave them rest round about, according to all that he sware unto their fathers: and there stood not a man of all their enemies before them; the Lord delivered all their enemies into their hand.

Comments:

A nation is blessed when it has rest from warfare, or when enemies are unable to stand before it in battle. What makes all the difference is whether God is on a nation's side. He is the ally that a nation should seek—not ungodly nations considered "world powers." A weak nation with God on its side is in much better shape than powerful nations that oppose God, for God could easily grind them to powder.

  

The Lord Fights for Israel (Joshua 10:8, 14, 24, 25; 11:6)

Joshua 10:8

King James Version (KJV)

8 And the Lord said unto Joshua, Fear them not: for I have delivered them into thine hand; there shall not a man of them stand before thee.

Joshua 10:14

King James Version (KJV)

14 And there was no day like that before it or after it, that the Lord hearkened unto the voice of a man: for the Lord fought for Israel.

Joshua 10:24, 25

King James Version (KJV)

24 And it came to pass, when they brought out those kings unto Joshua, that Joshua called for all the men of Israel, and said unto the captains of the men of war which went with him, Come near, put your feet upon the necks of these kings. And they came near, and put their feet upon the necks of them.

25 And Joshua said unto them, Fear not, nor be dismayed, be strong and of good courage: for thus shall the Lord do to all your enemies against whom ye fight.

Joshua 11:6

King James Version (KJV)

6 And the Lord said unto Joshua, Be not afraid because of them: for to morrow about this time will I deliver them up all slain before Israel: thou shalt hough their horses, and burn their chariots with fire.

Comments:
These Scriptures show that God, Who sovereignly controls all things, is the best ally on the battlefield. If the Lord fights for you, then you cannot be defeated. This truth is comforting to the godly army.

The Huguenot leader and general Louis I de Bourbon (1530-1569), or the Prince of Condé, exclaimed the following during the Battle of Jarnac:

My friends, true noblesse of France, here is the opportunity we have long wished for in vain! Our God is the God of Battles. He loves to be so called. He always declares Himself for the right, and never fails to succor those who serve Him. He will infallibly protect us, if, after having taken up arms for the liberty of our consciences, we put all our hope in Him. Come and let us complete what the first charges have begun; and remember in what a state Louis of Bourbon entered into the combat for Christ and for his native land![1] 

Unfortunately, the Prince of Condé died in the battle, which the Hugeunots ultimately lost; God does not always grant His people victory in battle, but sometimes chastens them as a loving Father. Nevertheless, Condé's words have merit: God is indeed a God of Battles, and he can and often does grant victory to those who trust in Him.  

Notes
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[1] Henry M. Baird, History of the Rise of the Huguenots of France: Volume II (New York: Charles Scribner's Sons, 1896), 302.

Military Victory by God's Control of the Weather (Joshua 10:11)

Joshua 10:11

King James Version (KJV)

11 And it came to pass, as they fled from before Israel, and were in the going down to Bethhoron, that the Lord cast down great stones from heaven upon them unto Azekah, and they died: they were more which died with hailstones than they whom the children of Israel slew with the sword.

Comments:
A major battlefield weapon is God's control of the weather, which can be so powerful that it can cause great armies to fall before smaller ones. 

Catholic Spain, a world power, was proven to the world that it was not invincible when God in His providence used a storm to sink many of the ships in the great Spanish Armada. 

And let us not forget how when William III sailed to England to liberate it from the tyranny of King James II, his landing that led to victory was due to favorable wind patterns.