At approximately 8:45 a.m. on 6 December 1917, the Belgian Relief vessel IMO struck the munitions-laden freighter Mont-Blanc in Halifax Harbour. The Mont-Blanc exploded in a devastating 2.9 kiloton blast, which killed 2,000 people and injured 9,000. More than 6,000 people were made homeless, and an additional 12,000 were left without shelter.

Bearing Witness tells the story of the Explosion, and the catastrophic damage it caused, through the eyes and words of more than two dozen journalists and record keepers who experienced it first hand. Their accounts reveal a unique perspective, offering new detail about the tragedy and providing insight into the individuals who struggled to articulate the magnitude of the shocking event to the rest of the world. In addition to the original work by journalists and record keepers, Michael Dupuis provides over 30 photographs and illustrations, several previously unseen, and a detailed timeline of journalistic activities from the time of the Explosion on December 6 to December 16.