In this map, you'll be up against Takumi and two retainers, Orochi and Reina. The leader of the resistance, Scarlet, will also take part in the battle, leading a small squad of wyvern riders. There are also four houses you can visit. Be careful of Reina, the Kinshi knight. She's going to be a bane of your fliers because of her range and her bow. She can also deal heavy damage to most Classes like spellcasters and healers so keep them out of her range as well.
There are two bridges that you can take. If you acquired the Armorslayer from the previous missions, you can use it to deal bonus damage against the Chevois knights guarding the eastern bridge. Felicia with her Tomebreaker skill is also exceptional in tanking the diviners on the western bridge. You can initially bring 10 units only so make sure you have Elise with you since she's your only healer. Defend the bridges since Orochi and Takumi’s groups will make their advance.
At the start of the third turn, Benny and Charlotte will appear as reinforcements. If you're bringing Camilla and/or Beruka, keep an eye always for Reina's attack range. Reina and her forces will remain still until you enter their attack range. The two cavaliers beside her have Beastkiller weapons, which can deal bonus damage to your riders. Make sure to support them with a foot soldier and switch him/her to her partner to avoid fatal damage. Be careful of the two wyvern raiders with knights as support that will fly in as you cross the bridges.
A lone ruffian will appear to the SW corner at the start of the 5th turn. He will attempt to loot the houses so you'll have to kill him quickly before he steals everything. At the same turn, several wyvern riders will appear from the other sides of the map. Make your way to the center of town and start aggro-ing the enemy forces. If possible, try to lure and prioritize taking out Reina as soon as you can.
Make sure that you collect all the items from the villagers before eliminating all enemies.