וַיַּעֲל֤וּ מִן־הָעָם֙ שָׁ֔מָּה כִּשְׁלֹ֥שֶׁת אֲלָפִ֖ים אִ֑ישׁ וַיָּנֻ֕סוּ לִפְנֵ֖י אַנְשֵׁ֥י הָעָֽי׃
Então cerca de três mil homens do povo subiram até lá, mas fugiram diante dos homens de HaAi.
Or HaChaim
וישב ממנו שבי, "and took a captive from amongst them." We need to explain why the Israelites did not appear troubled by the fact that they suffered a defeat at the hands of a single Canaanite nation. We could have expected them to extrapolate that if a single Canaanite nation could inflict a defeat upon them, what would happen when they would face all seven Canaanite nations? After all, we find precisely such a reaction by Joshua when he suffered a defeat at the hands of the inhabitants of the town of Ai (Joshua 7,5-9).