Current questions and answers regarding the map editor.

Is there a manual available on creating scripts for battles? Is it possible to create a scripted battle, for example, in one of the missions for Zehir in the TotE campaign, where a red knight attacks you, and instead of his Haven troops, demon units spawn on the battlefield. If Nival Interactive did it, then there must be a way to influence battles with scripts.
And, possibly a silly question, but how do you make a passable bridge? No matter how I try to work with it, it always turns out to be a static object that cannot be traversed.