Albert Barnes Commentary Joshua 5:1

"And it came to pass, when all the kings of the Amorites, that were beyond the Jordan westward, and all the kings of the Canaanites, that were by the sea, heard how that Jehovah had dried up the waters of the Jordan from before the children of Israel, until we were passed over, that their heart melted, neither was there spirit in them any more, because of the children of Israel." — Joshua 5:1 (ASV)

The Amorites were the principal of those nations that occupied the hill country of Judea (see note on Genesis 10:16); the Canaanites of those that dwelt on the coast and low lands. These words are therefore equivalent to “all the kings of the highlanders, and all the kings of the lowlanders”: that is, the kings of all the tribes of the country.

Until we were passed over - The use of the first person has been noted here, and in Joshua 5:6 , as suggesting the hand of one who himself shared in what he describes. But the text as read (though not written) by the Jewish authorities here, has the third person, as have some manuscripts, Septuagint, Vulgate, etc.; and a change of person like this in Hebrew, even if the text stands, does not of itself warrant the inference. (Compare Psalm 66:6.)