fascine

Originally a cylindrical bundle of small sticks of wood, and now often a bundle of plastic pipes, bound together, and used for strengthening purposes, such as in revetments for riverbanks, and in mats for dams, jetties, etc.

A similar bundle of sticks of wood or plastic pipes used for filling in ditches for armoured fighting vehicles to drive over, and for making parapets, raising batteries, and strengthening ramparts.

(figurative, rare) Something which is used for defensive purposes.

(New-Zealand) To use fascines to build or reinforce (something), or to fill in (a trench, etc.).