After a drive through the cemetery grounds the tour returns to State Route 675 (17.9). _Turn right_ and drive north to the junction (18.3) with State Route 676 which intersects 675 on the left. A _turn_ is made on Route 676. That route is followed to the end, where it connects with State Route 613 (19.1), known to history as the SQUIRREL LEVEL ROAD. [Illustration: _The moat and embankments of Union Fort Davis._] 25. Union FORT URMSTON was constructed in the autumn and early winter of 1864 on the west side of the Squirrel Level Road. It was named in honor of a Union officer killed at the Battle of Peebles’ Farm (September 29-October 1, 1864). The heaviest fighting of this engagement took place around Peebles’ Farm, three-quarters of a mile southwest of here. _Turn left_ on State Route 613 and continue to the intersection (19.6) with State Route 672 (CHURCH ROAD). State Route 672 is the right fork at this intersection. _Turn_ on this road and continue in a northwest direction. 26. FORT FISHER (20.3) is situated on the right side of the road. This Union stronghold is in an excellent state of preservation, and it is one of the largest earthen forts constructed in the Civil War. Fort Fisher played an important part in the campaign after it was built in late 1864. Near it was a 150-foot Union watchtower used to observe enemy movements and to spot artillery fire. Behind it, a short distance to the south, was a field of execution for military offenders and spies where, according to one observer, violators paid the supreme penalty nearly every week. It was a signal gun from Fort Fisher which boomed the beginning of the final assault on the defenses of Petersburg, April 2, 1865. 27. FORTS WELCH and GREGG. On the left of the road the Union line continues to these forts, the remains of which are not visible from the road. The tour is resumed on State Route 672, or Church Road. This runs from the Union to the Confederate line. The road crosses the tracks of the Seaboard Air Line Railroad and, later, overpasses the Norfolk and Western Beltline Railroad. The direction of the tour is north toward the Appomattox River (21.8). _Turn right_ at the intersection with State Route 603 and continue to the end of State Route 672 (21.3) where it intersects State Route 142. This road (142) was named the BOYDTON PLANK ROAD at the time of the siege. _Turn right_ on State Route 142. The direction of the tour is east along the Confederate defense line which was built south of Petersburg. 28. Confederate FORT GREGG (22.4). The partially destroyed remains of this fort are located nearly opposite a Union fort of the same name. Fort Gregg is situated about 100 yards to the left, or north, of the highway. It is memorable for the desperate struggle it put up against the Union attack on April 2, 1865. When it fell, the last Confederate stronghold on the outer line west of the city was in Northern hands.