Does anyone know of a system/ruleset that handles skirmishing/non-decisive combat well?

Lots of games that do combat seem to do decisive combats well, but few seem to handle combats where defeat/destruction of the one side or the other is not likely.

Or is this perfectly handleable in current systems and just needs a player/dm mindset shift?

edit: Given that my initial phrasing seems to have been unclear, is there any system that handles well (not just can do, but does smoothly and well) combat where at the end each side is degraded, but neither side is likely to be defeated. (and a failed moral check counts as defeated) Ideally such a system would include the ability to transition from this skirmish into a full combat also smoothly and well.