| REDAN | Arrow-shaped embankment as part of a fortification (5) |
| TEATOWEL | Duck swallows heads of tadpoles on western embankment, as it's useful for drying off (3,5) |
| FLOODWGATE | It may wash out bridges and embankments (as in this puzzle) / Onetime White House scandal |
| TRACE | Ground plan of a fortification; an amount of rain too small to be measured; the sum of the diagonal elements of a square matrix; or, a line marked by a recording instrument (5) |
| WORK | Energy transfer measured in joules; a creation such as a book, musical composition or piece of embroidery, sewing etc; or, a structure such as a wall, built as part of a fortification (4) |
| CASTLEKEEP | Strongest part of a fortification also known as a donjon (6,4) |
| CORFE | Village on the Isle of Purbeck, Dorset, housing a fortification famous for its defence by Lady Bankes against a parliamentary army during the English Civil War (5,6) |
| SCARP | What is the inner wall or slope of a ditch in a fortification? (5) |
| FOSSE | Ditch dug as a fortification (5) |
| BASTION | Projecting part of a fortification |
| KEEP | Preserve part of a fortification (4) |
| ARUMS | Flowering plants with arrow-shaped leaves (5) |
| SIEGE | Military action to surround a fortification (5) |
| CALLA | Plant with arrow-shaped leaves |
| BARBICAN | Outer defence of a fortification such as a castle, typically a double tower above a gate or drawbridge (8) |
| BULWARKHEAD | Leader of a fortification? (This answer is in a trade war with Bee of the dog) |
| ESCALADE | Military action of scaling the defensive walls of a fortification with ladders, common in medieval times (8) |
| ESCARP | Steep slope in front of a fortification |
| LOOP | Vertical slit in the walls of a fortification (4) |
| GAP | An opening, such as a breach in a fortification's wall; a col; or, a space between a train and a platform (3) |
