1)
Why does it say that also Yosef went to Beis Kel?
1.
Rashi: Also they went to conquer a place in their portion, i.e. Beis Kel.
2)
Why was Hashem with them? Pesel Michah was with them, for Michah was from Efrayim (17:1, and Pesel Michah was all the days of Mishkan Shilo (18:31, like Rashi writes there)!
1.
Rashi: This is like it says (Daniel 9:7) "Lecha Hashem ha'Tzedakah v'Lanu Boshes ha'Panim."