Peter and Dan Snow tell the story of when the Welsh - led by rebel leader Owain Glyndwr - last invaded England. The Battle of Shrewsbury was the scene of the biggest archery-centred conflict on British soil, and the final showdown came outside Worcester. On the way, father and son try out the weapon of mass destruction of the day, the longbow, and experience how Owain Glyndwr used the rough terrain of the Welsh borders to outwit his enemies. Show less