Der Spiegel discusses the failure of UN peacekeepers to prevent the Srebrenica atrocity. Reading this, I can't help but think that the reason they failed is because they knew they had to all practical purposes been abandoned, and would not be supported if they attempted to make a stand. Had they been, say, 370 US Marines, or 370 of the Aberdeen Regiment, or 370 Gurkhas, it's unthinkable that they would not have made a stand; and, had they been 370 US Marines, near-unthinkable that they would not have been supported in that stand -- and, if necessary, avenged -- by the full might of the US Sixth Fleet if needed.
But they were just 370 UN peacekeepers, left hanging out in the wind by the UN without support ... and as they blew in the wind, so blew 8,000 Bosnian Muslims.