"First blood" offline Heroes 4 tournament

Message from Mynos

...It is also forbidden to use "creeping," which is based on splitting and merging armies...

I don't quite understand this rule...You can't split the army...for example, into one or more simple units (send one wolf for reconnaissance, for example). Does a hero have to be in the unit? And can't an army from a castle be led to the main hero without a (secondary hero...)? That is, you can't send archangels on a journey...please explain...I want to play by the rules, but I don't want to waste time and then find out I did something wrong...it would be disappointing...;