Not sure if this is the right sub, but its the closest I could think of. If somebody holds both noble title (E.g. they're a baron or an earl or something) but they also are currently serving in the military and have an officer's rank (they're a Sargent or a captain or whatever) which title are they addressed by? Also has this changed historically, so is the answer the same for medieval England as it would be for modern day, and also does it vary by culture? I've been trying to figure this out for a while and keep coming up empty. Any thoughts?
For future reference, this kind of question is perfect for the Short Answers for Simple Questions thread.
In the period I study, senior officers were commonly addressed by their noble titles, either in combination with their military rank or alone. For example, Field Marshal Arthur Wellesy is universally known as the Duke of Wellington, and is often referred to in military writing as 'Field Marshal Duke of Wellington'. The Allied Commander-in-Chief during the 1813 campaign in Germany was commonly referred to as Prince Schwarzenberg, because he held the title 'Prince of Schwarzenberg'. Napoleon addressing his marshals used their titles as well, i.e. commonly using Soult's title 'Duke of Dalmatia' in military correspondence or calling Marmont 'Duke of Ragusa'.