It is difficult to work out how they would "set forth second", unless it means that the protecting flanks do not march until the whole of the vanguard has gone forward; in which case they are protecting the Mishkan and the Leviyim (Levites), but Yehudah is out there on his own - whence my description of him earlier as the vanguard. And surely both the north and south flanks need to set out simultaneously. Let us wait and see what happens to Dan.
The three Rachelite tribes together. Check what familial connections there are for the other configurations. Or will they prove to be geographical connections?
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