Prologue (Shadow Dragon)

A 4-part prologue was added in Fire Emblem: Shadow Dragon. This explains everything before the start of chapter 1, and is only available on the normal difficulty. This is also the only way to obtain the character Frey (he doesn't appear in hard mode or in the NES version of the game). In part 3 of the prologue, invincible soldiers appear to try to capture Marth, and you have to have Jagen, Abel, Cain or Frey sacrifice themselves by disguising themselves as Marth (this might explain Frey's absence in hard mode, as he must be he automatic choice for who gets captured/possibly killed).