FINALLY on the 5th try, I beat Squad Assault.
Team 1: 5*Raven,5*Spring Camilla,5*Abel,5*Takumi: Raven and Abel did most of the work.
Team 2: 5*Corrin(Male),5*Linde,5*Rebecca,5*Clair: Fun how I setup my team to look like Hoshido vs Nohr.
Team 3: 5*Nowi,5*Camus,5*Bride Lyn,5*Jaffar: Nowi tanked and countering the Archer while Lyn was healing her. Jaffar weakened the rest then Nowi and Camus cleaned the rest up. The only map that gave trouble!
Team 4: 5*Reinhart,5*Celica,5*Azura,5*Zepheil: Bait them to come towards the Z wall with Dire Thunder and Ragnarok waiting for them.
Team 5: 5*Hector,5*Effie,5*Sheena,5*Genny: The Armored Emblem with a cheerleader.
I was hoping that the seal was a team effort seal when a unit has it in the team, the rest of them gets 3+HP as well. Oh well....