1)
Seeing as until now they had also traveled by Divine command, why does the Torah write "Vayis'u ba'Rishonah al-Pi Hashem" (See Sh'mos, 13:21)?
1.
Oznayim la'Torah: Because it was the first time that hey traveled "be'Yad Moshe" - via the trumpets and Moshe's Tefillah "Kumah Hashem ... ".