Managing 8 heroes on the map.

In my opinion, this is a rather complex and not entirely obvious mechanic. To acquire loot, you need to: 1) sneak up to the one who has the loot bag, and take it; 2) run across rough terrain to the battle; 3) pick up the loot; 4) give the loot bag back to the "dad" so he can continue along the road; 5) take the loot bag from "dad" at the end of the day. In total, the "sneak" unit doesn't have enough movement points for this :(

You can use two "sneak" units. Usually, it happens like this: the "sneak" unit finds the loot and stays near it overnight. The next day, the squire delivers the army to him, the "sneak" unit breaks through the guards, and returns the troops to "dad."

Could you provide more details on how to calculate the army's trajectory?

Well, you connect points A, B, and C, and you get the trajectory.

These are typical logistics problems (in the business sense, not in the Heroes sense).

To see real-life examples, I recommend watching game streams through Mikogo; it might become clearer. You can find the stream numbers in the VT chat or in the corresponding thread in the online third game section.