okay so I am a experienced Fire Emblem player for sure. To the point where I have never gotten myself into this problem before, so I was hoping some one could tell me, 'its possible' or 'just give up'.

Problem: Im on Part III Chapter 13 Blood contract and I have not played in a while so my brother told me while I had Michiah and Sothe in the beginning to just focus on training them because I wont be using anyone else really for necessary purposes later on in the game. WELL now I only have a half decent Marshall and Trueblade (i say half decent because I had to use master crowns @about lvl 10) on the level prior), Miciah and Sothe and all the Royal nights and I have to hold out 12 turns before someone breaches the wall. I have tried over and over and cant make it past turn 6 without a hawk geting in... I tried targeting everything from having placed everyone to the center NOPE tried the ledge front and center and also tried complete roaming...

I half tried almost 8 times and I cant seem to get it... Advice please??