I recently watched a documentary on PBS about Grizzly Bear attacks in Glacier National Park, Montana in 1967. Tragically, two women were killed and the boyfriend of one of the victims severely mauled.
Speculation about the cause included campsites set up too close to the Bears' walking trail and two makeshift dump sites, injuries to the Bears making them more agitated, and the Bears emaciated condition due to hot weather and lower berry production.
My nagging question is if your going into bear country, why was no one armed? Not even a sidearm.