Thanks for posting the link. I read with fascination about the battle. I have studied Catholic persecution in England in some depth as part of my research for my Guy Fawkes' role. As I read, Sir Griffin Markham's name jumped out at me, and I was very happy to learn more about what he had been up to (and like) before his roles in the Earl of Essex's attempted uprising, the 'Spanish Treason' and the two 1603 plots against King James (the Bye Plot or Surprise Treason, and the Treason of the Main).
Your essay makes me want to delve deeper, although I have to admit I am 'behind' in so many areas I intend to study!