Immediately before and to the right of Redoubt C are the remains of a trench which runs upwards from the gully on to Fir Tree Spur. This is Frith Walk, a major communications trench to the front lines. Today, almost 100 years of rain and erosion has filled the trench in, so that the level is now well above the gully floor. Apart from the area around the treeline along the clifftop of the ravine, Fir Tree Spur is now largely ploughed fields. This means that the old trench lines have been lost, but the entrances from the ravine of a number, such as this one, still remain.
It is possible, with care, to climb into Frith Walk and to follow it (or at times, a path just above it) up to Fir Tree Spur and on to the open land. In doing so one is walking up to the front line on the right, in the footsteps of hundreds of men, many of whom still lie under the fields above, with no known grave.