Effusion of blood

Missed this, but Big Finish have put up the blurb for The Settling:

Note to Sir Arthur Aston, governor of the town of Drogheda, 10 September 1649.

"Sir, Having brought the army belonging to the Parliament of England before this place, to reduce it to obedience, to the end effusion of blood may be prevented, I thought fit to summon you to deliver the same into my hands to their use.

If this be refused, you will have no cause to blame me.

I expect your answer and rest your servant.

O. Cromwell."

Yes, that is historically accurate. At least, I copied it out of a book.

Busy writing stuff today which (for the moment) includes the lines, "But was the Armada invading? King Phillip of Spain had been married to the Queen of England, hadn’t he?" Discuss.