The defences therefore consisted of sand-bag revetments held in position by wooden frames over which expanded metal had been spread.
"The Story of the "9th King's" in France"
Enos Herbert Glynne Roberts
Instead of keeping the earthen walls from crumbling and caving by the use of the wicker-work revetments so general on the Western Front, the Italians use a sort of steel trellis which is easily put in place, and is not readily damaged by shell-fire.
"Italy at War and the Allies in the West"
E. Alexander Powell
In some places, either the pounding of shells or the thawing out of the ground had pushed in the revetments, appreciably narrowing the way and making progress more difficult.
""And they thought we wouldn't fight""
Floyd Gibbons