I immediately had a come back for the "well played" comment about it taking 3 people to fire it. Archery back in the day took skill, a lot of skill. You could hand these out and have three field hands operate it and they could lay down some serious power if they had a battery of these.
The chinese did a similar thing with an easy cocking crossbow with a magazine, they handed them to field hands and once they got fast they could put out a bolt i second i think it was, the bolts didnt even have flights on them, the just relied on pure volume of fire from all the field hands having them to create damage.
Here is a picture of it i found on wikipedia:

Basically all you do is pump the handle up and down and it would recock the string, drop a bolt and fire as fast as you could pump it.