The plan shows the developments to the fortifications around the eastern part of Brussells, thus where the Emperor's Palace is located.

The left sheet has been added to the right one seeing as the title cites the Porte de Namur which is now in the middle of the plan. The key on the left foreground explains that the gate on the left hand side is the Porte de Louvain. The plan also presents two profiles: one of a fort with precise measurements and one of the covered paths. These are also highlighted in yellow to show that they have been completely repaired.