I thought it was tomorrow night, Sun. Littlefinger wants power, but, it confused me quite a bit when he delivered her to Bolton because I also thought he had a thing for her just like he had had for her mom. House Tully is where Sansa's mom Kaitlyn was raised/of. He'll never be trusted by Sansa again.
House Tully - Game of Thrones Wiki - Wikia So I had to figure out why Jon & Sansa didn't wait for the Tully army. Rewatching some episodes may give an even clearer picture but here is what I think so far: Jon and Sansa may have already known the Tully army was held up with their own siege inside of their castle, key word, their uncle Blackfish. Brianne, woman knight, was sent to them to try and get them to assist Sansa(the actual Tully blood). Jaimiee, true to his word this time, let the Tully army go after the siege ended, so Jon and Sansa didn't know they were coming. The Tully army no longer has a home, the iron throne has given their castle and lands to someone else. SO!!!!! Castle Winterfell needs an army, the Tully army needs a home.... ya see where I'm going with that. The current head of the Tully house is being held captive and not going to be rescued. I'm reading into what info I see, but it is fun to look at it this way.
Winterfell - Game of Thrones Wiki - Wikia