When do the chapter 19 reinforcements end?

#1ReagsPosted 5/3/2013 1:18:25 AM(edited)
I'm playing Lunatic, if that makes a difference.

I'm trying to decide whether or not I should block a fort and have something like a 50% chance of losing Chrom, or just have him stay in a safe place.

I'm on turn 9. Last turn, reinforcements popped out on all forts, and looking at the patterns they spawn in, that looked pretty 'final' to me, but I just wanted to be sure.