WhiskeyintheJar Romance

George was to stop the Parliament denuding the Army of artillery [and thus hastening its disbandment] by securing the Oxford magazine; and then, with a troop of volunteers at his back, he was to proceed to Northamptonshire and prevent a second civil war by making sure that neither the Scots Commissioners nor their Presbyterian allies in the Commons put an ace up their collective sleeve by carrying off the King. 

I could't find an actual Fawkes themed story on my shelves but this takes place a few decades after (1640s) and is dealing with the end of the English Civil War and how now parliament and the army are fighting.