Fire Emblem: Path of Radiance/Chapter 10: Prison Release
The group reach the castle and meet King Caneghais who shares a tale about Greil to Ike and co. He tells them that Ike and Mist were both born and raised in Gallia and revealed that he was the one that roared in the forest to scare away the black knight. Caineghis also informs the group that he cannot let the Princess of Crimea stay in Gallia as it would be giving daein an ideal excuse to attack, but he does suggest that Elincia should go to Begnion for aid. The group is now forced to head back to Crimea as Gallia has no ports. On the way, Ranulf informs them about a castle holdin Crimean soldiers. the group heads in their and prepares for a fight.
 Base Preparation
After receiving the 20000 gold from Ranulf it's time you got to work. Forge a thunder tome for Soren which has maximum power, maximum accuracy and minimum weight. Then make sure each character has an iron, steel and ranged version of their weapon (heal and mend for Rhys) also buy an Elwind tome for Soren to replace the wind one.
Once again increase the levels of Rhys and Soren to help them catch up with Boyd and Oscar, after this add/remove skills as normal and view and support or info conversations you want to watch. After this save the game and begin the battle.
 The battle
There are two different strategies to this level, one gets you very little exp or bonus exp but it generally used in speedrun's and the other lets you get lots of experience at the cost of time. The first involves Volke rescuing Ike and both of them escaping at the same time. This is possible without fighting once as the guards won't raise the alarm unless they are attacked or they see you. Using this you can cleverly dodge the Guard's attack ranges (their sight range) and get to the exit quickly and efficiently, For this method you only need Volke and Ike.
The other method requires Oscar, Boyd, Soren, Rhys, Titania, Ike and Volke. This strategy revolves around purposefully triggering the alarms so that you can get as much exp as possible. On the first turn move Oscar, Boyd and Titania to plug up the corridor that you begin in, next you send Ike, Rhys, Volke and Soren East to trigger the alarm. Position the group so that Rhys is protected from enemy attacks. Once the alarm is triggered and your characters are in formation, end the turn.
The enemy should attack you at the entrance and once these enemies are defeated move Boyd and Oscar to the right to aid Ike's group. Use Ike to deal damaging blows to the enemy and then finish them off with Soren. Once these enemies are defeated open the doors to the cells with Volke and talk to Nephenee and Brom with Ike and Kieran with Oscar. Once this has been done kill the soldiers to the north but be careful about not walking into the enemy general's movement range. Once these enemies have been defeated direct the partner units into the yellow squares, then you can deal with the boss.
One all the enemies have been defeated, all the chests have been opened and all of your units (other than Ike) have escaped. Have Ike to escape and win the level.