50 Next Abimelek went to Thebez and besieged it and captured it.

Read Judges 9:50 Using Other Translations

Then went Abimelech to Thebez, and encamped against Thebez, and took it.
Then Abimelech went to Thebez and encamped against Thebez and captured it.
Then Abimelech attacked the town of Thebez and captured it.