You know, sometimes for the sake of a good fic, you have to handwave your premise. If the execution is good, it's perfectly fine by my standards! I trust you can come up with something to satisfy our scruples, and then move on to execution.
At which point of the 7 Years War would you suggest Fritz to be captured?
Ooh, interesting question. If you want to go with historical occasions on which he narrowly escaped capture, as opposed to inserting a fictional capture at a convenient point (which is also legit!), the first two candidates that come to mind are Kunersdorf, the absolute nadir of his misfortunes, when he was nearly captured in the battle (against the Russians) and had to be rescued by some of Zieten's hussars, and the plot by this guy to take advantage of the fact that Fritz wasn't heavily guarded at Prussian headquarters. I believe the latter took place in late 1761, i.e., shortly before Elizabeth of Russia died.
Re: Lucchessini, Catt and Fredersdorf, oh, my
At which point of the 7 Years War would you suggest Fritz to be captured?
Ooh, interesting question. If you want to go with historical occasions on which he narrowly escaped capture, as opposed to inserting a fictional capture at a convenient point (which is also legit!), the first two candidates that come to mind are Kunersdorf, the absolute nadir of his misfortunes, when he was nearly captured in the battle (against the Russians) and had to be rescued by some of Zieten's hussars, and the plot by this guy to take advantage of the fact that Fritz wasn't heavily guarded at Prussian headquarters. I believe the latter took place in late 1761, i.e., shortly before Elizabeth of Russia died.