I believe the English had a requirement for men to bring their equipment to church on Sunday and practice afterward.
This eventually led to American Militias to bring their firelocks to church on Sunday and practice drill afterward. It would make a modern faintheart “faint” to see armed men drilling on the church parking lot today!
Your answer makes a lot of sense.
If I had to guess as to why I would remember such a vague crude hand drawn pictures, of an archery field, with the dimensions, is because for me, it was my first experience of seeing a "METRIC" dimension(s) as an adult if you will.