Fire Emblem Heroes: Squad Assault 1 Guide

Free-to-play tacticians, here's how I passed Squad Assault 1 to acquire the Squad Ace A 1 Seal. By borrowing the strategies of people who are a lot better at this game than me.

You can definitely pass it with vanilla 4* units without Skill Inheritance, as long as you have enough of each color type at level 40. Might take a few tries to test which units can fill each role, though.
  

*** Obligatory Possible Spoiler Warning ***