565. Did Joshua kill everyone in Gezer?


Yes

Then Horam king of Gezer came up to help Lachish; and Joshua smote him and his people, until he had left him none remaining. Joshua 10:33

No, they were still there a little later.

Neither did Ephraim drive out the Canaanites that dwelt in Gezer; but the Canaanites dwelt in Gezer among them. Judges 1:29: