That’s all three big battles in the show (Blackwater, The Wall & Bastardbowl) decided by a third army showing up in the nick of time and saving a losing force from being wiped out.
Jon Zombie Snow is a truly woeful military commander, why do people follow him? Sansa should be proclaimed Queen in the North and marry Sweetrobin.
Why didn’t Ramsey have scouts looking out for the Vale army (or any other reinforcements)?
Where was the Bolton cavalry (and archers) when the Vale Knights attacked?
Why didn’t Sansa tell Ramsey the Eagles were coming; she could have negotiated a deal where they got Rickon back alive and Ramsey slunk back to the Dreadfort.
The Maesters will have to cook something up to take out the dragons next season.