Joshua 4

² “Choose twelve men from among the people, one from each tribe, ³ and tell them to take up twelve stones from the middle of the Jordan, from right where the priests are standing, and carry them over with you and put them down at the place where you stay tonight.” NIV

Each of you is to take up a stone on his shoulder NIV

On their shoulders, from right where the priest are standing, put it down at the place where you stay.  What detail!  God wants it done a very certain way.

And then when their feet touch the shore, a mile wide wall of water comes rolling past their rapidly beating hearts.  Jericho must have been completely stunned.