What does Judges 1:4 mean?

Israel's campaign to defeat and drive out all the remaining Canaanites in the land begins as Judah and Simeon band together (Judges 1:1–3). They strike against the Canaanites and a smaller people-group known as the Perizzites, which live in and around the territory given to the tribes of Judah and Simeon.

It's unknown where in this region the city of Bezek was located. Scholars believe it was near what would become the city of Jerusalem. According to the literal words of this verse, ten thousand enemy fighters fall at Bezek as the Lord gives the victory to the people of Judah. In biblical literature, numbers like "10,000" were often used as symbolic references to very large numbers. This is much the same as how modern English-speakers might say "I spent a million dollars getting my car fixed." The exact number of troops defeated is not the main point—the purpose is to indicate that the victory was massive and overwhelming.