-Warfare in the high medieval period
with the introduction if the stirup the cavalry can assume the role of "shock troops" and can easily break infantry formations, this single invention give rise to the "knight" as the most dominant unit in the high medieval period.
-Feudalism
feudalism is a social and military organization with the economic organization being "Manorialism". Feudalism is where the lord will employ vassals, the vassals will fight for his lord in exchange for land and the lord is a vassal to the overlord of the land the king, when the king go to war he will call upon his vassals the lords to join him in battle in exchange for land this give the lords another name known as "warlords", the warlords will call upon his own vassals the Knights to join him in battle with the king in exchange for land the warlord won from the war and will give the land he won to his knights, this system allows the noble elite the Knights to have the land they needed to generate wealth from the peasants in order to not only earn their loyalty but to supply the Knights resource and money to purchase Armour, weapons and horses.
-The Knight
the knight is a vassal to a lord, and is the dominant unit in medieval warfare, they trained, born in the fires of war, aggressive and experts in combat,armed and armored to the teeth, the knight is the elite class of soldiers of the time, the problem of Knights is that their tactical value is often in question with much more practical commanders. Because Knights are nobles every knight foreign or otherwise will treat each other with some degree of respect towards one another, a knight caught alive will worth a huge ransom which will ensure your survival, this treatment towards one another is called chivalry a code of ethics and behavior a knight must follow at all times, the code of chivalry is important because it ensure the loyalty of Knights to their lord.
we often heard of Knights in shining armor, protecting the weak and bringers of justice...but that if you trust Shakespeare, if you ask a historian a knight is an aggressive warrior in it for the wealth, glory, honor, fame, and the thrill of war and carnage. Chivalry does not apply to commoners only to other Knights, there have been many accounts of Knights killing ordinary citizens is because they can and they will.
the good news the only requirement to become a knight is to be aggressive, warlike, and can kill man, woman, child, and beast and can still be able to sleep at night, go on make your dreams come true (but seriously guys don't kill anyone for no good reason it's not cool)
-weapons and Armour
in this period only the lords and Knights can afford steel weapons and Armour, everyone else will be armed and armored similar that to the early medieval period. Knights are armed with an assortment of weapons like the lance and sword they are also armored with heavy full body plate armor or some parts of the body at least, alongside with a chain mail mesh underneath and a leather vest or tunic with a surcoat as the cherry on top to carry their heraldry, you imagine that the Knights are heavy and bulky they are but have enough mobility to be a force to reckon with in the battlefield. a more revolutionary weapon the crossbow compete with the bow more specifically the English long bow of who is the best projectile weapon of the period, because the crossbow is expensive to make due to mechanical parts the longbow is more cheaper and effective, but the crossbow offer something's the bow cannot, the crossbow is very similar to a modern day rifle without the recoil point it to the enemy pull the trigger and he is dead is is very easy to train peasants with crossbow than with longbows because the longbow demanded more strength to the user which will require years of training unlike the crossbow only a week of training, also the crossbow can easily penetrate the plate Armour of Knights in close range than the longbow which the arrow will just bounce off if the Armour is high quality which is every plate Armour used by Knights.
-order of battle
the battle of how it was wage is just like the early but with a twist I will give you a tip, it requires a large amount of Knights in your army.
the archers (or crossbow if your super rich) will rain arrows (or bolts) on the enemy formation, if the enemy formation become fractured or an opening present itself the fun starts. Knights will charge and expose the crack of the formation and open up the gap wider, when the infantry catch up the enemy formation broken most will run and retreat giving you the victory.
in the high medieval period the knight is dominant because they are the only expertly trained me experience soldier available, victory will be decided on whoever have the most Knights in his army and who employ them better Knights can only be countered by other Knights because the spear man will either be broken up by arrows, flee, or the Knights crush them with heavy weight of their horses and Armour, it's all about the knights which characterize the high medieval period of warfare.
-Fortifications
the early medieval period is characterize by the threat of Vikings and barbarians this give rise to feudalism and fortifications, this is by building a fort to watch over the land and is the seat of power by the lords, high stone walls, towers with arrow slits, a fortified gate, a moat, burning tar, if you watch any medieval movie or a fantasy battle of siege this is quite self explanatory, the castle or the city the wall defend is also ready for a siege, canals to carry water to the city and large cellars for food. forts become important is because the barbarians of the early period is only raiding and not an actual invasion even a single fort can deter any raiders.
-Siege warfare
siege warfare is not new, the ancients and the Romans did it one way or another, but because of the development of fortifications, and high stone walls being build almost everywhere, siege warfare became one of the most bloodiest warfare ever participated by a medieval army, there are many ways how to besiege a fortified city, we will look at every one in dept. there are 5 techniques of siege warfare one by one I will explain it.
1)Mining
simple enough mining is a siege technique where sappers will destroy the support columns of a wall, the destruction of these columns will result to the wall being unstable and thus collapse, once the wall is down the infantry will ruse into the gap and fight the defenders.
2)Sitting
by definition siege means "to sit" the singing army will "sit" and wait until the defenders run out of food and surrender, because the sieging army encircle the city the city cannot produce or get supplies for the populous thus surrendering, this siege technique is comical and a complete waste of time, but there are some degree the siege will be a success but unlikely.
3)use of siege engines also known as breaching
the most well known and overused siege technique is to use battering rams to bring the gate down, catapults to bring the war down, and siege towers me scaling ladders to get over the wall. most siege engines are made in field, more on that later.
Known siege engines:
-the siege tower
the siege tower is a fortified mobile tower used to get over the walls, unlike ladders the tower is protected by wood and wet animal skin to prevent fire as well as arrow slits for archers to shoot from. its made by stories or levels and at the top a ramp is used to fight the defenders, unlike other siege engines the siege tower is made in the field rather than being per-fabricated this is due to their size that may hinder an army on the move.
-Trebuchet
the trebucket is a catapult used by medieval armies to destroy castle walls and other fortifications, instead of arching the projectile the trebucket "throws" it giving it more power and accuracy than the ordinary catapult, this siege engine are made in-field, the Romans per-fabricated their catapults to use against armies but unfortunately per-fabrication of siege weapons or the idea of it is lost with the roman empire.
-Battering Ram
the most common and recognizable siege tool the ram could be a large platform with a swinging tree trunk used to smash open gates and fortified doors, other variation are iron beams or the most simple a wooden trunk carried by men to open doors.
-The Cat and Weasel
an unusual but real siege engine it is a large elevated platform with an "arm" used to bring the wall down by "clawing" it, best to imagine a cat clawing the wall. the Cat is not always like this it is a combination of other engines for example a large platform with a trebuchet on top and a ram underneath. The Weasel is similar to the Cat the only difference is the Weasel is lighter and use an iron ball than a "claw".
4)Spies and Sabotage
if you ever watched the movie "Troy" starring Brad Pitt or heard about the Trojan horse then I don't need to explain this to you.
spies are sent into a castle town before the siege and conduct acts of sabotage such as water poisoning, spread of false rumors to break the defenders spirit, make the defenders desert and try to open the castle gates as well as acts of assassination.
5)Psychological and bio weapons
using diplomacy or threats to break or make the moral of the defenders, the use of dead animals and corpses by catapults to spread disease to the defenders, and the application of intimidation and false rumors to spread panic, not common but not unheard of.
other weapons like the balista(large crossbow) is not present in the medieval ages for 2 reasons: 1.the balista or the knowledge of creating the balista is lost due to the fall of the roman empire and 2.if the balista do survive it will find little use as much of medieval fortification are stronger then before or the damage of the balista is very limited on a siege and better employed againts armies instead of a stone wall.
. maybe more detailed explainations would be fun