Used mainly in literary texts or to mimic old-fashioned English, not common in everyday conversation. They left gold and silver, and therewith the villagers prospered.
Pro Tip 2/3
Archaic Tone
Creates a formal or outdated tone, which might be used for effect in modern writing. He offered advice, therewith cautioning against hastiness.
Pro Tip 3/3
Avoid Modern Misuse
Don't use it in modern settings where simpler words like 'with it' or 'thereby' are more appropriate. She bought a dress, therewith to wear at the banquet. (Archaic)