1. 3500 yards of new communication trenches.
2. New artillery trench (1600 yards) dug for advanced positions of three brigades.
3. 4300 yards of old communications cleared at least once; trench boards raised in part on “A” frames, and berms cleared back.
4. 2800 yards of tramway cleared and track raised 18 feet in places; a very successful job, enabling large quantities of ammunition for trench mortars, etc., to be run up. 1000 yards of new tramway laid, including tramways to gun positions.
5. 10 heavy trench mortar emplacements with at least 10 feet overhead cover, and mined magazines holding 200 rounds; these proved very successful and saved many casualties.
6. 38 medium emplacements proof against 4·2 H.E. shells.
7. 7 artillery observation posts in Arras and 7 trench observation posts with mined dug-outs; also telephone exchange at sewer exit in Arras.
8. 1500 yards of roads cleared and repaired, and 3 subways made for passage under roads.
9. 4500 yards of infantry tracks made, with a small amount of assistance from infantry of the Fourth Division. 3000 artillery tracks made, including 35 bridges. Overland tracks made along 4500 yards of communication trenches. Pontoon bridge over the Scarpe repaired for pack transport.
10. Additional water storage for 1500 gallons, and about 2000 yards of piped supply to battery positions.