duckboard

I stamped on the duckboard and kicked the sides of the trench and jerked my rifle up and down just to keep myself awake.
Combed Out|Fritz August Voigt
It was about a mile from the line down a "beautiful" duckboard track.
500 of the Best Cockney War Stories|Various
Shell-holes and trenches everywhere filled with water till choice of movement was confined to a few duckboard tracks.
The Story of the 2/4th Oxfordshire and Buckinghamshire Light Infantry|G. K. Rose
At some 'posts' there was nothing better to sit on than the muddy 'fire-step' or at best half a duckboard or an old bomb box.
The Story of the 2/4th Oxfordshire and Buckinghamshire Light Infantry|G. K. Rose

As we were coming down the duckboard track after being relieved Jerry started to put over a barrage.
500 of the Best Cockney War Stories|Various

British Dictionary definitions for duckboard

duckboard

/ (ˈdʌkˌbɔːd) /

noun

a board or boards laid so as to form a floor or path over wet or muddy ground

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012