Joshua Recap

I must confess to being a little confused by Joshua, although familiar with the myth,these massive conquests and genocides seem to have escaped history unnoticed, save by the perpetrators.
I find myself perturbed by the lack of detail. With such big events we should expect not only more from the winners but from outside sources. Sadly to mention again these events are unrecorded anywhere else.
This suggests either they are complete fabication or bible scholar's have their sums and dates wrong. It seems to me, admittedly with no evidence, that Joshua's conquest was part of the "Sea peoples" invasion that are recorded at least in part in some of the Armarna letters.

To be honest I see most of Joshua as pure bullshit.

Walls falling down with trumpets, the sun standing still and a bunch of nomads achieving world domination. This strikes me as having more to do with long nights and strong wine than any facts.