I speak Turkish, so have been reading a lot on the Turkish news sites, and social media. I have seen the photos of the beheaded soldiers, and other news footage of mobs surrounding and attacking soldiers and one man begging to kill an injured soldier in order to satisfy himself. The mobs (you will notice very few women), are right wing Islamists who are the sort who have been attack bars, Kurdish political parties, those minorities such as Alevis etc who aren't seen to be 'true' Muslims.
The Turkish army is made up of conscripts - all men have to serve for 18 months, and most do at a young age. (However, if you are rich, you can pay to convert to a few weeks). Some of the shots of seen are of scared young men.
I have heard a rumour that the generals had news they were due to be arrested on the Saturday morning, and so the coup was to try and stop that happening.