Institutio Oratoria

But we must remember that arrangement is generally dependent on expediency, and that the same question will not always be discussed first by both parties. An example of what I mean, to quote no others, is provided by Demosthenes and Aeschines, who adopt a different order in the trial of Ctesiphon, since the accuser begins by dealing with the legal question involved, in which he thought he had the advantage, whereas the advocate for the defence treats practically every other topic before coming to the question of law, with a view to preparing the judges for a consideration of the legal aspect of the case.