(Before the Beginning of Chapter if you have less than 15 units in your entire army)

Malledus:
“Sire, we’ve received an offer of help. It would seem there are those who wish to join our ranks. Naturally, the possibility of espionage worries me… but they seem honest enough.”

Marth:
“We do sorely need the help… If they still wish to fight, tell them I will gladly have them!”

(Replacement unit(s) join)