L' ingénieur de campagne, ou traité de la fortification passagère
Clairac's L'ingénieur de campagne, ou traité de la fortification passagère is a 1749 French treatise on field fortification, published in Paris by Charles-Antoine Jombert for military engineers and officers. Its plates are precise engraved plans of bridgeheads, river crossings and entrenched camps, drawn with fine hatching, dotted lines and small sketched troop markers that a designer could borrow for schematic, diagrammatic map styling.
