Any roleplayer wanting to maximise their chances in strategic-level battle encounters will of course study the classic masters. The Roman Army. The Strategicon of Maurice. Sun Tzu's The Art of War.

If only those armies of antiquity had had to deal with hordes of orcs led by magic-wielding evil high priests, or three-dimensional battles in space, it might even be of some use against the canny GM.

Transcript

GM: Enemy fighters peel off and hurl eerily silent laser fire in your direction.
R2-D2: I'll handle this. Maximise forward shields. Clones, rear flank positions, side shields on full.
Clone Trooper: Yes, sir.
R2-D2: The classic tortoise formation. Totally impregnable. The Romans conquered most of Europe and Asia Minor with this.
Obi-Wan: I think I read about that. Didn't they have more than five soldiers?
Anakin: And only two dimensions to deal with?
GM: You see a flash of blinding light on your left flank. {a clone gets blown up}
R2-D2: Okay, we're doomed.
R2-D2: I can eject from this shemozzle, right? I don't need to breathe.