I'm curious to know if there have been any armed conflicts that are generally regarded as full blown wars (i.e. not border skirmishes) which were started accidentally. By accidentally, I mean something along the lines of some person(s):
- Killing someone by mistake (e.g. an important person of one party)
- Unknowingly crossing borders that should not have been crossed
- Misspeaking in an important official gathering (e.g. offending another party)
or things along similar lines.