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That's the whole point. My husband plays in a really interesting way: he levels up his heroes as much as possible, gathers them into one army, and goes around defeating everyone without any creatures. About 4-5 heroes and 0 creatures. You have to agree, it's original, right?
I think I know your husband :D, just kidding, I'm just saying that I have some acquaintances who sometimes use the same gameplay style in Heroes 4.
And I, on the contrary, think this feature is useful. You don't have to run to the city for an army or hire a hero-guide, which takes a lot of time, and the army comes to you. In my opinion, it's great!
You're probably talking about a caravan, not a hero... But overall, this is really a big plus of Heroes 4! The ability to send troops on a "journey" is a serious thing :)
"Единственное, что можно сказать с уверенностью об удаче - она изменит..."