He took an active part in opposing the
Covenanters throughout his earldom. In 1671, shortly after gaining the power to take such actions against criminals and debtors within his earldom, he obtained an arrest warrant for
John Graham of Duchray for disobeying the orders of the king by failing to repay a debt. Learning that
Thomas Graham of Duchray (the son of John Graham of Duchray) was to attend a baptism, the Earl of Airth took advantage of this family gathering to execute his warrant. And so on 13 February 1671, the Earl and Alexander Muschet, along with a well armed party, made their way to the bridge to arrest John Graham of Duchray who was known to be sympathetic to the Covenanters, and who likely politically opposed the 7th Earl. John Graham of Duchray held papers of protection from the king, and said "What dar ye do? This is all your masters", but the papers held protection from removal from certain lands, and not from a civil debt. The son of Thomas Graham of Duchray, ripe for the christening at the kirk in
Aberfoyle in 1671, was placed upon the ground and the Duchray party prepared their swords, guns, and muskets, avowing that half of the Earl's party would be killed and the other half would drown. It is said that the Earl was narrowly missed by several bullets, and one of the Earl's party, a Robert MacFarlane, lost two of his fingers. John Graham of Duchray was placed in the
Edinburgh Tolbooth. ==The end of Menteith and Airth==