Why does it say "va'Yishme'u"?
Malbim: They heeded the rumors that it was built for evil, and did not judge them favorably.
What is the meaning of "la'Tzava"?
Radak: It is like bi'Tzava. We find like this
Why did Bnei Yisrael prepare for war?
Rashi: Bamos were forbidden once the Mishkan was fixed in Shilo.