Typically, a Western European army in CK times would be composed of 4 elements
1) Household, a standing hvy cav force, no more than a few hundreds strong
2) Feudal retinues, they wer free for 40 days typically, after that payment had to be provided and also compesation for losses, specially that of warhorses. Usually feudal forces were called only from the regions close to the war, at least in large kingdoms.
3) Mercenaries, become ever more prominent in the XIII and XIV centuries, but they were always present in earlier times
4) Conscripts. These usually were some kind of region/city militia, not just mere peasants as some tend to think (peasants were recruited however in the feudal retiniues, basically as servants and camp followers). Their fighting value was very different from regions and times, but usually they were the bulk of any army, and they suffered high attrition through the campaign because of desertion
Campaigns usually were planned in winter, when depots were stablished and supplies recollected. Armies mustered in may, when fresh grass was available to horses in the field. Delays were very common, and campaign could start well into summer, to be called off in winter. Main problem in winter was to keep cavalry in the field, however siege operations could be, many times were prosecuted.
I would like to see feudal retiniues separated from conscript/mercenary forces, being cheaper (for 40 days at least) and with higher morale.
Regarding weapons, I would like to see
Knights
Light Horse
Inf
Pikemen (late period)
Shot (bows/crossbows)
Siege machines (including guns of all kinds)
