Where did they think it was, and why did that site turn out not to be correct? What were the arguments that convinced you and others that, gee, this actually is not the correct location?

In the 19th century, there were two sites put forward.

One was Etel, which is the site that you mentioned was excavated previously.

And the other was El Araj, where we are.

Again, the early suggestions at Etel were primarily because there were surface remains, significant surface remains, columns, ashlars.

things of that nature, and they assumed that that was the remains of first century Bethsaida Julius.

Julius is the Hellenistic name given to the site, and so they were drawn to that.

Okay.