Joshua 8:10

And Joshua rose up early in the morning, and numbered the
people
To see if there were any wanting, and to put them in proper order for their march:

and went up, he and the elders of Israel, before the people to Ai;
these elders were either the seventy elders who went with Joshua as council to him; or it may be rather they were inferior officers, who went at the head of their respective corps under them.