My tale begins in the midst of the 2nd Napoleonic Wars (1815, after Napoleon's Victory at Waterloo, to 1831). The armies of Spain have fallen to Napoleon II in a lightning campaign during 1822. The British army, led by Sir James Hawthorne, gathered the allied armies of Prussia, Austria, and Britain under one banner during Napoleon's attack on Sweden. The year was 1823. France had extended it's control to the borders of Hanover, and Austria and Prussia were ready to come to Britain's aid if need be.
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The battle, to be Napoleon II's worst defeat of his reign, took place in October of 1823. The order of battle is as follows:

British- General Sir James Hawthorne (command 570 men)
3rd Scots division
1st Royal Yeoman of London
91st Welsh Regiment of Cavalry Pride of Wales

Prussia- King Frederick III (command 340 men)
1st Brandenburg-Prussia Grenadier Regiment
46th Musketeers
6th Cuirassier Guards

Austria- Field Marshal Prince Ferdinand (command 600 men)
9th Vienna Musketeers
8th Rifle Corps
1st Bohemian Division

French- Emperor Napoleon II Napoleon the Sun Emperor (command 2000 men)
I Corps, Murat
IV Davout
VI Corps
VII Corps Corps de Espanol
Le Imperial Guarde
XI Napoleon's Guard
Paris Artillery Battery
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Napoleon II invaded Hanover in 1823. Facing him was the most rag-tag bunch of soldiers every. It was a mix of Austro-Hungarian, Prussian, and British soldiers.
Sir James Hawthorne, a Scot by birth, led the British army. Prince Ferdinand led the Austrians, and King Frederick III led the Prussians.
The French advanced their army about 4 yards forward, and the artillery opened fire. The French cavalry guard rode forward as the Austrians formed square. Prince Ferdiand rode around in the front, as the French cavalry rode among the squared Austro-Prusso-British army.
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Phase one was an artillery bombardment from the French artillery. Prince Frederick of Prussia advanced the Grenadier regiment, and Prince Ferdinand followed with the Bohemian division. The volley fire which ensued was magnificent. The British army advanced forward 50 yards, until they were face to face with the IV corps, where volley fire was exchanged. The small Protestant church in Hanover was now burning, as the French destroyed with artillery. The Welsh Foot/Cavalry advanced by 50 yards, when the cavalry caught the I corps by surprise, routing them, and killing 100 of them. The I corps broke, and Marshal Murat was shot and killed. Emperor Napoleon II then brought up the XI and Corps de Espanol. By now, the French were beginning to panic with the continuous hit-and-run attacks of the Prussian Cuirassier, and the pounding volleys of the Austro-Prussian troops. The British army moved to the side, and engaged the Corps de Espanol just as they were marching. One regiment broke, but the rest turned and volleyed fire back. The British formed square, as they saw the Cavalry Regiments coming, and the French Guard Cavalry slammed into the lines of Yeoman Soldiers from London. It caused mass casualties. Halfway through the battle, Prince Frederick, crown prince of Prussia, fell on the battlefield, noble to the very end. The Prussians saw their prince fell, and fought for him as if he was a martyr. King Frederick III also fell, and his 2nd son, Prince William, effectively took control of the army as King of Prussia. Prince Ferdinand charged forward with the Bohemian army, meeting them in a brutal melee, in which he fell, wounded, and carried off the field. The VI corps (600 men), then turned their attention to the massed lines of redcoats ready to fight and die for their King. The French army marched forward, and was hit with volley after volley from the Yeoman and Scots Guards. The Welsh cavalry came around from the back, and routed the artillery. The Paris battery was effectively crushed, thus saving the Austrians from any more casualties due to artillery. It was now 3 hours into the battle, and only the I and VII corps had routed. The VI corps had lost about 200 men. Then, finally, as the sun was setting, a miracle came. The XI corps, Napoleon's Personal Guard, and the Imperial Guard, broke to the 800 Austro-Prussian army. A victory cheer was let out, and the slaughter began. As the French backed away and ran, the brave British, Prussians, and Austrians charged away and fought to the death the French.
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As night approached, there was burning buildings, scattered bodies, and guns lying on the field. On a hill, a flagholder stood, accompanied by a drummer and fifer, as he held the British flag up high. The Prussians and Austrians joined in a singing of God Save the King. A magnificent battle nonetheless...The armies dispersed, as Mozart's Requiem in D Minor played silently..