Adam Clarke on Joshua 7:2

Sent men from Jericho to Ai - This is the place called Hai, Gen 12:8. It was in the east of Beth-el, north of Jericho, from which it was distant about ten or twelve miles. From Jos 7:4, Jos 7:5 it appears to have been situated upon a hill, and belonged to the Amorites, as we learn from Jos 7:7. It is very likely that it was a strong place, as it chose to risk a siege, notwithstanding the extraordinary destruction of Jericho which it had lately witnessed.