I recently saw while learning Navi that before crossing the Jordan that Yehoshua gathered all of Klall Yisroel and told them that they would experience miracles in their conquest of Eretz Yisroel. Rashi cites that he gathered them (Yes all 600,000 of them) between the 2 poles of the Aaron and the Malbim cites this that once they saw that it was understood that they should prepare for the what to behold the next day.
This may sound a little trivial, but if they were explicitly (see Yehoshua 3:4) commanded before not to approach the Aaron by 2000 Amos how could they have been gathered between the Aaron for the miracle to even occur?