The height of English Power came in 1415, nearly 80 years after the war began.

Henry V was the present king of England at this time, and having more or less recovered from the effects of the Black Death with new people to take up the sword, lance and bow in the fight against the French.

In 1415 Henry took advantage of the French division into two separate nations and invaded Normandy, an old ally from when the war began who wanted to keep their independence during the invasion of France.

Following their successful campaign there to seize control the English Army matched back to Calais,
Only to be ambushed by a massive French Army, more then three times in number at Agincourt in the north of France.

The battle was devastating ..  for the French!
Although heavily outnumbered the English won a decisive victory.

Hails of arrows from the English Longbowmen meant they would shoot almost constantly, and with great accuracy;
The French army was largely built up of cavalry and infantry which were slow and clumsy in all the mud and from having to navigate the forest woodland - Not an easy task at all, but they would have also been weighed down with heavy armor.
In this battle Nature was a large decider on the battle field, with recent heavy rains contributing to the outcome.

After the battle at Agincourt Henry lead his remaining army to Calais, the original destination to regroup and rest.
It wasn't long after he invaded further into France taking much of the Northern and Western areas;
Very nearly completing his grandfather, Edward III's ambitions in France.

A few years after the battle the English once again allied with Burgundy, now completely separate from the rest of France.
In their new found position of power the Duke of Burgundy proceeded to conquer county of Boulogne,
Then Hainaut and the bishopric of the Cambrésis.

With much of France under English control, the French King, Charles VI, arranged a new treaty with Henry V in 1420.
The two met just south of Paris, in what was left of the French controlled area of the country and signed a treaty called,
The Treaty of Troyes which stated that Henry V was the legal king of Northern France, and would inherit the full crown to rule
both the North and South of France following the death of Charles VI effectively to run both England and France as a duel kingdom.

The Treaty of Troyes meant Charles VI held the title King of France, so the same title wouldn't have suited for Henry V, who was ruling in the north, thus the title 'Heir of France' was adopted instead.

Unfortunately however both Henry V and Charles VI died within two months of each other in 1422.
Henry V's infant son (Charles VI's grandson) Henry VI then became King of France, aged a mere nine months old!
He was the only English king who was actually ever crowned King of France.

Due to the age of their new king a Regency Government was instead established to rule England and France until Henry VI was old enough to rule on his own - a miscalculation on Henry V's part having died before his son was even a year old.

Later in 1429, France having lost much of their army at Agincourt were still continuing to fight minor skirmishes, but didn't have the morale to forge any real offence, or defence against the attacking English troops.

1429 was the beginning of the turn over for France, a new beginning was soon to begin.
A young girl aged only seventeen approached the French Army, and declared she had seen visions from 'god' in which he told her to save her homeland of France, and gave her the strength and courage to do so.

At the age of 16, the girl named Joan of Arc, asked a kinsman, Durand Lassois, to bring her to nearby Vaucouleurs where she petitioned the garrison commander, Count Robert de Baudricourt, for permission to visit the royal French court at Chinon.

 Baudricourt's sarcastic response did not deter her. She returned the following January and gained support from two men of standing: Jean de Metz and Bertrand de Poulengy. Under their auspices, she gained a second interview where she made a remarkable prediction about a military reversal near Orléans.

Robert de Baudricourt granted her an escort to visit Chinon after news from the front confirmed her prediction. She made the journey through hostile Burgundian territory in male disguise and upon arriving at the royal court she impressed Charles VII during a private conference. He then ordered background inquiries and a theological examination at Poitiers to verify her morality.

Later Joan petitioned Charles VII at Chinon to allow her to lead the relief force to Orléans, and despite been left out of council meetings and battles although the reason behind such is unclear, and open to historical debate.
She wasn't to be discouraged however, and broke the siege of Orléans in only Nine Days capturing the fortresses of Saint Loup, Saint Jean le Blanc and the main English Stronghold of les Tourelles.

During the assault on les Tourelles and Arbalest Bolt of the English had struck Joan in the side of the neck, although despite this possible life-threatening injury she still continued to battle at Tourelles, inspiring the army to a complete victory.

Following the success Charles VII had granted her co-command over the entire French Army along with Duke John II of Alenço.
She was also given royal permission to launch several attacks to recapture the bridges Loire River as a prelude to advance on Reims, where Charles VII could be officially coroneted as the King of France.

This was a bold proposal as Reims was twice as far away as Paris, and deep in English-held lands.
Along the way they captured a number of previously English-held cities including Jargeau, Meung-sur-Loire and Beaugency.

The army was also due to march on Patay when an expected English Relief force arrived under the command of Sir John Fastolf.
The battle of Patay could be seen as Agincourt, but in reverse; as the French Cavalry knowing of Fastolf's arrival were able to attack before the English Archers could finish setting up defence preparations.

A rout followed in which much of the remaining English Army in the area was defeated, with only minimal losses for France.
Fastolf escaped with a small army of soldiers, and as such became the English scapegoat for their humiliating defeat ...