Soldiers in khaki, grey or blue uniforms, depending on the country, and women wearing Red Cross nurses uniforms were presenting authentic objects and equipment from the 1914-1918 war.
Other volunteers were dispatched on key battlefield areas around Verdun. They didn't re-enact any fighting out of respect for the sites, which have since become a symbol of peace.
Instead, German and Polish volunteers were sharing tips about military clothes and historic anecdotes with their French, Australian and English neighbors at the encampment.
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The 10-month battle at Verdun — the longest in World War I — killed 163,000 French and 143,000 German soldiers and wounded hundreds of thousands of others. Between February and December 1916, an estimated 60 million shells were fired. Entire villages were destroyed and never rebuilt.
The former battlefield still holds millions of unexploded shells, so that housing and farming are still forbidden in some areas.