My first though was Hannibal and Scipio, but there weren't any trebuchets in the mediterranean basin at that time that I can remember.

"The Last Trebuchet at Sunrise" is a Clone Wars fic in which Rex (possibly with Ahsoka and/or Anakin) has to mount a desperate defense against Separatists droids using dreadfully archaic technology after the planet got EMP'd from space.

Rey-as-Anakin-reborn, the fic where the Force needs a new Chosen One and reuses the same template but forgets to clean the mold (...this metaphor got away from me) and so Rey grows up on Jakku with the ghost of her former self as her shadow.

Me too, honestly.

Percy Jackson and the Olympians/Heroes of Olympus: Thalia and the Hunters, between the wars

Percy Jackson and the Olympians: Luke Castellan, at the end.

<3

Thank you!

Hannibal and Scipio at Ephesus.

NAtasha after Civil War, picking up the pieces of her life.

The sky opens over the fields of Cannae before the battle is halfway over. The Carthaginians break rank, the Roman route is worse. When they regroup a week later the Romans have a new general -- one who allied with the Carthaginian -- and Cthulhu isn't even going to know what hit him.

Me too, honestly.

I wrote that one already! (In the end, Leah-centric post Journey Into Mystery 641 gen)

Same player shoot again?

This sounds like a Star Wars timetravel fic.

Leia Organa goes back in time to the Clone Wars and has to team up with Anakin Skywalker.