Some beginner gameplay and strategies questions

[thejeff]

It likely has nothing to do with what the army from A did.

Occasionally 2 armies crossing will block each other instead of fighting on one of their territories. They will also sometimes swap provinces.
There is a bug, where this happens repeatedly if you continue trying to move the two armies. It's not clear whether it happens at all without the bug.

[Vanguard X]

Does dominion spread follow along movement paths only? In other words, if 2 provinces appear to border each other, but they are not connected (cannot directly move troops into) does dominion spread as if it is 1 province away, or more than 1?

Example: Impassable mountains separating 2 provinces.

[Amhazair]

Originally Posted by Vanguard X

Does dominion spread follow along movement paths only?

Yes.

[Soyweiser]

Originally Posted by Amhazair

Yes.

Normal dominion only spreads along movement paths.

However, there are spells and random events that influence dominion. And there is nothing stopping sneaking domspreading units from being inside your lands.