What factors change an attack result?

[Holby]

 I used espionage on someone, and using my computer calculator, I found I had the following offense higher than my opponents defense...
1283990 (skiffs total o advantage)
1609766 (stoats total o advantage)
1848433 (rats total o advantage)
The highest is obviously the rats, but it was repelled.
Guards affect the result, but by how much?
And, what else is involved?
I'm fairly sure this was more than a 5% advantage, I haven't worked it out, though.
Thanks,
-Holby

[Retto]

 Guards, as has been said in the Guide, are worth 500 Defense points. Also, you have not factored in allied defense.  

[Holby]

 And raise defences :rolleyes:  

[Retto]

 Raised defenses don't actually raise defenses, but decrease troop loss.

[Holby]

 NOTE: Just made fool of self
NOTE II: Will not give an excuse
NOTE III: I learnt Roman Numerals off a clock and my Ninja Turtle videos.