forgive me if I'm off-topic, but I just got an idea to recommend both to you on the forum and to the developers.
As someone has pointed out, it happens in M & B that entire armies of a faction turn their attention to a small castle of an opposing faction located on the opposite side of the world just because its garrison is with few men, perhaps in relation to some recent evidence which has decreed this condition.
It is clear that a large army or more armies must move along the map and therefore must bring food for humans.
At stake, in a few words, we fill the food inventory and then we start with the attack.
This leads the enemy to defend himself in his territory by coming to us from the front, or, if he can avoid us, to go to our territory to create problems.
But it is difficult to happen because since we started a lot ahead of them, we could have time to do what we have to and get back in time to stop them.
In reality, the armies that march on the front must have a constant supply line of provisions, weapons and more.
So I thought: why not make sure that a LINE OF SUPPLY is established between the point in the map where you are and the last place visited?
The strength of this line depends on the place you left behind and allows you not to use the food in the inventory or slow down the consumption, which without the line, suffers quite heavily. (Clearly are parameters to be evaluated, I I give only the qualitative idea).
It also affects the morale of the battle and the quality of the troops.
In this way, an attacking army is forced to attack from several fronts to cover a larger area and prevent the enemy from circling the army to hit the supply line and prevent the advance.
On the other hand, the attacker will also hit the enemy supply line to benefit from the advantages.
deepening these lines:
1) the support capacity depends on the color of the line and its length, depending on the last place visited and the distance from it.
- Better is the city / castle / village left behind, more towards red is the color of the line, which symbolizes the ability to support.
- the greater the distance from the city that has been left, the longer the line will be and its color will turn towards a colder color.
as with the tracks on mount & blades that turn from red to blue.
A less warm color leads to a less efficient line, due to the difficult management of the supply, given the distance.
In support of this line the camps / outposts come into play.
2) THEREFORE the support line must be built while traveling, practically building small temporary outposts (like camps).
We spend money and resources (lengo and other stuff).
Maybe these camps can have different levels, so as to change their defenses and adapt them to different situations.
On construction time I can not say, maybe the different levels of camp can affect this variable.
The number of encampments affects the quality of the line
3) It is clear that each army will have its support line and it is clear that the city itself may not be able to meet the needs of many armies for a long time.
Assuming that there are 2 lines for 2 different armies and one of them loses its own, the latter can hook to that of his ally of the same faction going into one of the camps built by the latter (clearly consuming resources faster) .
These are all operations that do not take a long time, but that greatly influence the strategy on the game map, making cities, castles and villages much more important and their economies very important in order to support an army to invade a border territory .
In addition, the importance of a "marching formation" of the armies, which must protect the line or the lines, must also march trying to cover them and defend them from possible assaults on the shoulders or on the sides.