Finish in 5 turns

You can replace Ninian with Azura or Effie with Subaki both can be used as a check on red cavalry. Any red tome mage can replace Sanaki as a check on the green mage(Celica or Tharja). Brave lyn can be replaced with Bridal Cordelia to deal with Hawkeye and cavalry units.

Ninian

Effie

Brave Lyn

Sanaki