Duckboards

Duckboards are wooden walkways. They are usually put over muddy ground. Doing this means that people can walk on the dry duckboards instead of the muddy ground.
Hiking.
Duckboards are used to allow hikers to walk over wet and/or muddy ground, like a swamp or shores of a lake. Very wide duckboards are used sometimes so that wheelchair users can use them. Duckboards can be nailed into logs with wooden stakes.
World War I.
During World War I, duckboards were put along the ground of trenches on the Western Front. This is because the trenches usually flooded. Mud and water would stay in the trenches for months. The boards helped to keep the soldiers' feet dry. It also helped stop soldiers get a disease called trench foot. Trench foot is caused by standing on wet, muddy ground for a long time. They also helped soldiers move along the trenches faster. Sometimes, falling from duckboards could be deadly. Some unlucky soldiers drowned in mud because of their heavy equipment.