The Halifax Town Clock and Citadel Hill plan to turn their lights out Monday night as part of a commemoration of the start of the First World War.

The #LightsOut campaign draws inspiration from a remark made by Sir Edward Grey, Britain's foreign secretary, on the outbreak of the war. "The lamps are going out all over Europe; we shall not see them lit again in our lifetime," he said in August 1914. 

The clock, citadel and some parts of the harbour bridges intend to go dark at 10 p.m. The hour-long tribute remembers those who fought and died in the Great War. 

"Haligonians are encouraged to pay tribute to those who fought in the Great War through participation in these commemorative activities and by turning their own #LightsOut," wrote Corinne MacLellan of the Great War Centenary Society.

MacLellan says a better understanding of what happened in 1914 could help prevent future conflicts.

"That's not something that's lost on certainly those veterans that we've been working with, you know, what we're seeing happening in the Middle East," she said.

Other citadel programs include accounts of Canada's entry into the war and a spot to recreate the experience of enlisting in the military.