If one army has six thousand men and another has perhaps ten or twelve thousand, the larger army possesses an obvious advantage only if enough of those men can engage effectively.
Place the smaller army behind a bottleneck and the local balance changes.
The men waiting behind the front still exist.
They simply cannot all reach the fight simultaneously.
This is why terrain can behave like additional soldiers.
Not because bushes kill attackers.
Because bushes determine where attackers can stand.
Edward's archers were placed to exploit that restriction.
Men-at-arms prepared to receive those who reached the line.
The prince retained some mounted capability for later use.
The position could not guarantee victory.
Nothing could.
It could buy time.
For an outnumbered force, time was the beginning of every possibility.
The Longbow Worked as Part of a System
English military legend often reduces battles like Poitiers to a simple equation.
English longbowmen fired.
French knights fell.
Victory followed.
The reality was much more complicated.
Longbows were powerful weapons in trained hands, capable of high rates of shooting and effective battlefield disruption.
They did not automatically pierce every piece of good plate armor at every distance and angle.
Armor quality varied dramatically.
Some French men-at-arms possessed excellent protection.
Others were less completely armored.
Horses were vulnerable.
Faces and limbs were vulnerable.
Lighter troops were vulnerable.
Most importantly, a storm of arrows affected movement even when every projectile did not penetrate armor.
A man under fire lowers his head.
A horse struck by an arrow may rear or fall.
A wounded animal becomes an obstacle.
Men crowd toward whatever cover exists.
Formations lose alignment.
Officers have more difficulty keeping units together.
Arrows therefore shaped the battlefield physically and psychologically.
At Poitiers, the longbow was effective because the ground made avoiding its effects difficult.
Terrain slowed.
Archery disrupted.
Men-at-arms finished close combat.
Those elements belonged together.
Remove one and the others become weaker.
The French Had Learned Something Since Crécy
French commanders were not ignorant of the danger.
Crécy had taught them that massed mounted attacks against prepared archers could become disastrous.
At Poitiers, many French men-at-arms would therefore advance on foot.
This was a genuine adaptation.
A dismounted knight does not lose control because his horse is wounded.
He presents a different target.
He can push forward through broken terrain.
But armor remains heavy over distance even when well designed.
An experienced man-at-arms could run and fight in armor far more effectively than popular myths suggest, yet advancing over hundreds of yards through vineyards, hedges, uneven fields, missile fire, and crowding still consumes enormous energy.
By the time the French reached Edward's men-at-arms, they would already have paid physically for every step.
That cost would accumulate with each successive division.
This is one of the hidden dynamics of Poitiers.
The English did not need every arrow to kill.
They needed the French to arrive tired, compressed, and unevenly supported.
John Organized His Army in Depth
The French army contained major divisions under senior nobles and royal princes.
An initial mounted element included troops under the marshals, intended in part to threaten or disrupt the archers.
Behind came large bodies of dismounted men-at-arms.
The Dauphin Charles, eldest son of King John and future Charles V, commanded an important division.
Another force was associated with the Duke of Orléans.
The king himself retained a large body around the royal standard.
This structure offered depth.
If one formation failed, another could attack.
Depth can grind down defenders.
It can also produce fragmentation if successive attacks lose coordination.
That danger was not obvious at the beginning.
To John, multiple divisions meant repeated pressure.
To Edward, they offered the possibility of fighting one part of the French army before the next fully arrived.
Which interpretation became true would decide the battle.
The Opening French Assault
The earliest phase involved mounted French troops moving toward the English position.
The objective appears to have included disrupting the archers and creating space for the larger dismounted attack.
This made tactical sense.
Archers are most dangerous when allowed to stand and shoot freely.
Mounted men could potentially cross ground quickly enough to break their positions.
Yet speed requires room.
The approaches near Edward's line did not provide ideal conditions.
Hedges narrowed movement.
Archers concentrated fire.
Horses hit by arrows became difficult to control.
Some animals went down.
The mounted action lost cohesion.
Important French commanders were killed or captured during the initial fighting, including Marshal Jean de Clermont, who was killed, while Arnoul d'Audrehem was captured.
The assault failed to clear the archers.
That mattered because every French formation following now had to face a defensive system still largely intact.
The first attack had spent strength without solving the main problem.
The battle had begun to consume French resources.
Then the Dismounted Men Came Forward
The Dauphin's division advanced.
This was not a disorderly crowd.
These were armored men-at-arms, many drawn from powerful noble households, accompanied by experienced retainers.
They knew they were participating in a decisive royal battle.
They knew the king was behind them.