Scotland is one of the best examples of how organized religion really f@#k's you up. If I had a pound for every person who's been screwed over by the kirk or chapel in Scotland, I'd be a rich man. John Knox unleashed the genie the century before, and the Civil War in Scotland was more about the "Good Book" (and misinterpretation thereof) than about anything else.
The covenanter's and their relationship to both King, the Church of Scotland and the Scottish Parliament is a long and complex story. However, the Kirk's religious commissars have a large part in the blame of the deterioration of the Scottish Army's performance through the Civil Wars. Kilsyth, Dunbar etc., all came crashing down mainly due to these guys holding the upper hand at key moments.
So to that end one of these small minded, religious zealots had to make an appearance in the force. What better place than on a command base, hectoring the troops. Here, the Paster Jack Glass, from Dalmarnock, shouting "The Beast is coming! Down with the Pope in Rome" and other less savoury epithets.