Order of weapons fire / damage?

[Grandpa Kim]

6.8.4.1 ... If A attacks both B and C in a sector, then the movement order could be B, C, A or it could be C, B, A.

Although you would naturally assume A, B and C are three different empires, I have come to believe that 3 different fleets are all you need. So, if he came in with two fleets, luck of the draw could easily give him first shot. I don't know if this is true, but I'm getting that feeling from my own experiences.