Questions Regarding Firing and Assault Resolution

[jckerr4]

I have read the manual and still can not grasp the firing and assault resolution.
What do I need to know?
I would like to be able to have a good enough understanding to decide if firing or assault is feasable.
I have attempted to work this out on paper and keep getting stuck
Is there some other document that details the mechanics?
Is there a rule of thumb that someone could recommend?
What should I be considering when attacking?
Number of troops, Morale, Fatigue, Attack Value, Defense, Assault, Terrain, Modifiers... What else?

Here is the basic example I was trying to work out
This from B44#00
I moved the 2 units into a clear area and was trying to predict the low and high number of of casualties
I should be able to determine the random number by reverse engineering the casualties.
I there a way to "see" the random number for each event?

I./GR 295 (18,5)
Axis
642 Men
Movement 24
Morale C
Fatigue 0
Hard 6/1
Soft 8/1
Assault 10
Defense 16

81st Eng Bn (17,6)
Allied
650 Men
Movement 21
Morale D
Fatigue 0
Hard 6/0
Soft 10/1
Assault 10
Defense 16