They did some, e.g. Military Conflict data extracted from Wikipedia Infoboxes, April 24 2012 (which also shows the type of detailed provenance info they keep for bulk data loads). There are 5,581 battles (a subset of the 10,529 military conflicts).  There's a list of all the military conflicts available here, but now that Freebase is read-only there isn't an easy way to generate a table of dates & locations through the GUI, so some (a tiny bit) of programming would be required to extract the info.

Tom