I don't believe we said it was our national sport? Think it's you Americans that assume this.Anyhow,you're wrong:
Since the Welsh conquest of Edward I, the longbow had been becoming increasingly important and numerous in the English armies of the day. Firing as many as 6 shots in a minute for sustained volleys, massed archery fire could begin to dwindle the numbers and resolve of an opponent starting at about 200 yards range. Over the next 100 years, the English longbow with its yard long arrow and armor-piercing bodkin point would give a striking arm to the little bands of brothers from England that would empty the saddles of knights from the low-countries, France and Italy. The hours of practice needed to master the powerful bows (some of which exceeded 120 pounds draw weight) made archery the national sport of England by royal decree.
Learn something new everyday eh? lol.
These days England has no official national sport,although Football and Cricket which were invented there are considered to be such,with football being the more popular sport by far!