Crossword puzzle clue "defense made of trees"

(French) a barrier made of felled trees or branches, also ABATIS

CEDAR, a large evergreen coniferous tree

FIR, an evergreen tree

CASSIA, a relative of the cinnamon tree

to build an embankment to retain water

a Syrian cloth of goat's or camel's hair; an outer garment made of it, also ABAYA