Considering that society have become more progressive and civilized over time and most of the cruel way of things in civilian life that were common in Early Modern Era(from hanging drawing quartering to slavery) was long abolished by the 1914, I don't see why the military would be more cruel/bloodlusted/whatever you name. But common image is that way, especially the atrocities committed against civilians are never mentioned in the Early Modern Warfare while they're portrayed as a central part of WWII/Russian Civil War, and to a lesser extent, WWI. How accurate is this?
/u/elos_ provides some insight into the myth of gentlemanly Napoleonic warfare.
Tag-on question. Did late 17th-18th century armies target civilians less than 16th-yearly 17th century armies in the religious wars?
If so did the bloodbath of the religious wars contribute to this change?