Mercenary Squad

Mercenary Squad is Chapter 6x of Fire Emblem: Shin Monshō no Nazo ~Hikari to Kage no Eiyū~. This chapter is reached if the player beats Chapter 6 in 20 turns or less on Normal Mode (each higher difficulty progreeively adds 4 more turns to this limit). Alternatively, the player spose to have Rickard recruited and alive in order to access this Gaiden Chapter.

Recruitment
To recruit Ceaser and Radd, you have to clear the chapter without killing them.