This man was seized by the Jews and they were about to kill him, but I came with my troops and rescued him, for I had learned that he is a Roman citizen. (NIV)
This man was seized [as prisoner] by the Jews, and was about to be killed by them when I came upon them with the troops and rescued him, because I learned that he is a Roman citizen. (AMP)
This man was taken of the Jews, and should have been killed of them: then came I with an army, and rescued him, having understood that he was a Roman. (KJV)