The first shows the terrain and the road that links Armenia to Nagorno-Karabakh, albeit from one position:http://www.bbc.co.uk/news/world-europe-35967341

The second is interesting, the BBC's explanation:
A BBC team visited one of the artillery positions of the Karabakh Army and spoke to the soldiers there
Link:http://www.bbc.co.uk/news/world-europe-36019192

I noted the sleeping quarters are a concrete bunker; the connecting trenches to the artillery positions are very wide and have timber revetments. The artillery - not sure what type - are in freshly dug positions. One soldier says they had only been there a day before being shelled, so I expect the artillery were moved in as the crisis developed.