Spear - Lots of available troops. The spear is the weapon of mass attacks. It is designed to be in formations and to create a "head" of a flank or front. The use of spears creates a VERY distinct line of combat. These are often produced in bulk, and realatively cheaply. The later versions, of pike and pole-axe are designed specifically for anti-cavalry use. Big cities that produce many troops would have these.
Short Sword - Used by professional armies only. These weapons are used primiarily by soldiers who are life long. The sword belongs to the army not the soldier, but they are sturdy, durable, and meant as a defensive weapon. This is the choice of weapon when the formation breaks up (out of spears) and goes hand-to-hand out of formation. Big cities that produce many troops would have these.
Longsword - Used only by nobility and armored soldiers. This is a weapon of status more than anything, and its use is to counter other like units. A Armor-killing armored unit. It is very generic, as its designed to be used a-horse as well as a-foot. Very expensive to make, these are made only for people who can afford them, much like MOST armor.
Axe - This is used by anyone/everyone. This is the most common weapon in existance next to the spear. But where as the spear is a weapon that finds itself in the hands of large armies, Axes find themselves in ANY army that is not of Professional Origon. Professional armies neglect the axe outside of its tool functionality. The Axe is not a weapon for professional armies because it does not lend itself well to formation tactics (wide swings scare your neighbor), they are for the individual warrior, or band of warriors whom are badly organized and cannot afford more professional weaponry. However, as they are VERY cheap, it takes no time to grow an army out of them. Where as all "professional" weapons take a long time to train people in the use of. Excellent weapon for raiders.
2-hander: Only used by non-professional armies. These were basically weapons of war designed for that use by the same people who commonly use the axe. These of course take training, but are used by very adept individuals whove shown prowess in combat, and/or the bravery to take on mounted soldiers. Theya re very rare, as their use is very difficult. No professional army uses them because a well trained group of men can do a better job at disrupting cavalry than one man with a big sword. Again, big swings scare your comrades
Club-type weapons- Precuresur and eventual replacement of the shortsword, serving the same roles as the shortsword but proving more effective and defeating armored targets. Maces in particular were more expensive to make than Morninstars, but they lasted longer as well. The Mace was the melee equivilant of the crossbow, easy to use, requires little training, and durable. The shortsword could be equated to the short bow if we want to make analogies. Since the mace was cheaper, professional armies could be trained even faster and more effectively, leading to larger unit sizes. Armor was still a mitigating factor.
Halbreds/Pole Arms: These were truly the final moments of hand to hand combat warfare, designed to be all-in-one purpose armes for an army they were devided still into anti-cavalry and anti-armor divisions. The halbred was prollythe pinacle of armed combat. It functioned as an axe if need be, to remove limbs from opponents when the opportunity showed itself, but primarily it was a spear/pick combination that was used to deadly effect. The spear point was able to be used in normal formation combat, the spike(pick) on the rear was useful for penetrating armored targets that either were already on the ground, or up too high for other combat options. Also, if a knight was a removed from combat, a swift poke with a spike quickly ended the knight. As a mutli-function weapon they easily supplanted most major weapons as the primary weapon (Swords and maces and the like still made excellent back-ups), and therefore only the elongated polearms remained fundamentally different, there purpose was single - deter and kill cavalry.
ARMORS:
Armor was used to counter weapons, the weapon usually comes first.
Most armies are unarmored, most combatants in history have been unarmored (even pre-gunpowder) Armored combatants are either one of three things. Mercenaries, A professional soldier, or a warrior caste member.
Lighter Armors:
Leather/bronze combinations: These were most often used in the ancient bronze and iron ages. A sheild would be the biggest source of protection for a soldier. Bronze sheilds for the greeks, and Wooden Tower sheilds for the romans are examples. But the heavy armor they wore (they were considered heavy infantry) usually was around the shins and upper torso. The helmet was usually bronze and meant to prevent damage from blows deflected (no armor could usually withstand a direct hit from most weapons). The greeves were to protect under the feat. The main torso was either Hard Boiled leather to prevent cuts and scrapes, and the occasional glancing blow, or it was plated/woven bronze, meant to resist damage from slings and lighter weapons.
There were many variations on this, but primarily this armor was to prevent war fatigue, War fatigue being the conditions of warfare that create many opportunities for injury that do not directly stem from someone trying to kill you. Only training and sheilds could do that. Armor also served as a way of holding additional equipment and arms, as well as being a status symbol. Also, Armor was useful against oppoants who had no weapon, making their fists hurt a lot less.
Medium Armor - Chain, Stripped plate, and scales.
Most mail was an attempt to increase the security of an individual soldier. Mail was used mostly by nobility (until much later in the medieval period) and other important persons. Ring male and Scale male are the most notable examples. Each was designed to create a feild around a weak point on the body that would reduce the damage done by a given weapon. Mail in particular was invented to all-together stop slashing problems of swords. WOunds fester, and many soldiers die of disease more than weapons, preventing ANY wound is a way to keep the soldier alive. Mail creates a "second skin" that slashing weapons grate over, but fail to penetrate. Penetration weapons are very seldom stopped by mail, which is why since MOST weapons are percing, the common soldier rarely used it. Only in situations where axes and swords were used were they particularly effective (and not effective against the axe as much because of the crushing "bluedgeoning" power that also comes with the axe). Knights and Noble warrior caste members were the ones to use said armor because they usually targeted each other for a fight, and as the longsword was the weapon of close combat for the nobility, it also became one of the more deadly weapons TO nobility. Armor was prohibitively expensive, and professional armies did not employ their use until later in the period, when plate was common, and mail was cheap(er).
Plate mail - Plate mail was a realatively early invention, but prohibitively expensive and heavy. Bronze in particular is MUCH heavier than iron, and therefore a soldier simply could not operate and move on a feild of battle (much less for duration) if he was wearing so much armor. Plate mail was the first real "defensive" armor instead of "protective" armor we think of today. It was designed to STOP weapons. Including piercing weapons and ranged weapons. This is where truly the first "counter-counter" arms design began. Armor was invented that stopped spear points from penetrating and long distance, one had to use fulcrum, leaverage and the like to perice the armor, all the while the barer attacked you with his own weapon. However, plate had weak points and weapons were designed with these in mind, hence the "spiked" weapons evolution, the mace, and the morningstar and lance etc.
The fundamental problem with plate, is that it was ALWAYS prohibitively expensive, Only knights, and the warrior castes could afford them, and only they in particular wanted them. Knights, mostly mounted, were near impervious to infantry without specific anti-armored calvary weapons. ANd they could move fast enough to avoid arrial arrow assault. The combined nature of their hight advantage, speed advantage and realative imperviousness, gave rise to the highest point of knight warfare. Heavy Cavalry couldnt be stopped, except in general by OTHER heavy cavalry. This became untrue very quickly as elongated pikes and other weapons were designed to kill the horses, dismount the knights, and perice the armor. Archers were the first and also last to truly damage the prowess of the knight on the battle field. Bows became stronger, so armor had to become thicker. Crossbows themselves, with realative ease of produce ended the armored era. IT cost a LOT to arm, armor and mount a knight. It cost virtually nothing in comparison to arm a small LEGION of crossbowmen. When a cheap man can kill an expensive man, the expensive man becomes obsolete. THIS is warfare.
Armor was designed to seperate the expensive men from the inexpensive men, and it was never without understanding the tactics of the day. In MOST pre-gunpowder warfare, the army that lost was the army that ran away. Inciting fear, and forcing the other side to run away from the front is the ONLY way to really win. Therefore, tactics were designed in which to force the enemy to break and run, ARMORED oppoenents were the tanks of their day, in taht they were designed to smash into the enemy and break the line. The knights werent necessarily able to kill on a 10 to 1 basis, but if they smashed the line, and the enemy broke and ran, then they could do that and better. If for example a dismounted knight went up againts an unarmored maceman, both having sheilds...i would put my money on the man who doesnt have a lot of weight on him, and can move more nimbly. The knight of course, more likely has the better training however. And in warfare, training is everything.