1. Canadian involvement in the Battle of Passchendaele
These pictures of the Battle of Passchendaele in World War I show the horrendous conditions in which the Canadian Corps fought.
Earlier battles had destroyed the drainage system and record rains, the heaviest in 30 years, made the battlefield a sea of water-filled craters surrounded by a thick swamp of mud.
The mud was so thick it immobilized tanks. Walking was impossible and several of the pictures show the soldiers using trench mats, platforms of strips of wood used to get footing.
After three months of fighting, the Canadians seized Passchendaele on November 6, The Canadians distinguished themselves and nine Victoria Crosses were awarded.
Victory meant over 15,000 Canadian wounded or dead for an advance of just a few square kilometres of mud.
source:

2. Lieutenant-General Arthur Currie, Commander of the Canadian Corps at the Battle of Passchendaele (He was reluctant to send the Canadian Corps into the Battle of Passchendaele, predicting heavy casualties.)
source:

3. The Canadians fought in a sea of mud at the Battle of Passchendaele in 1917 A destroyed drainage system and torrential rains left the Canadian Corps fighting in a sea of mud at the Battle of Passchendaele
source:

4. This picture shows the mud and barbed wire the Canadians had to navigate through to avoid deep shell holes at the Battle of Passchendaele.
source:

5. Tank sinking in mud
source:

6. The Canadian Pioneers are moving trench mats in this picture of the Battle of Passchendaele. Wounded and prisoners can be seen walking in the background.
source:

7. In this picture of the Battle of Passchendaele the Canadian Pioneers are laying trench mats, platforms of wood strips used to give soldiers a firm footing.
source:

8. This picture shows soldiers of the 16th Canadian Machine Gun Company holding the line in shell holes during the Battle of Passchendaele.
source:

9. Canadian soldier sorts things out after a German shell rearranges his dugout.
source:

10. More than 15,000 Canadians died or were wounded during the Battle of Passchendaele. Many of them drowned in the mud and shell holes.
source: