we reposing especial trust and confidence in your loyalty , ability , courage and good conduct do hereby constitute and appoint you to be colonel and commandant of the fortress of doune , cardross , and balinton , and to take your rank as colonel in the army from the date hereof , you are carefully & diligently to discharge the duty and trust hereby committed to your care and to perform everything which belongs thereto in as full and ample a manner as any commandant of any fort or castle in scotland is vested with , and you are to follow such orders , directions and commands as you shall from time to time receive from us , our commander in chief or any of our generals , or any such orders as you shall receive from our secretary 's office .