Weitzel's Map of XVIII Corps lines, dated June 30, 1864.
I have the honor to submit with this the report of Captain Farquahar, chief engineer of the Eighteenth Army Corps, as follows:
...June 30, no regular approaches have been made, as, until we invest the town, it would be almost useless, for the enemy can fortify to the rear as fast as we can approach. No details of batteries were sent in drawing ,because for the most part they are irregular, having been made out of the infantry parapets strengthened. In the sketch our lines are marked in double red lines, the enemy's in black. On the map are the dates each line was taken up.
Brigadier-General and Chief Engineer
OR XL,Part I, pp 678-679.