reconnaissance

Reconnaissance comes from French reconnaissance, a noun derived from reconnaître ('to recognize, to survey, to make oneself acquainted with'), from re- ('again') + connaître ('to know, to recognize'), from Old French conoître, from Latin cognoscere ('to get to know, to learn, to investigate'), a compound of com- ('together, completely') + gnoscere/noscere ('to know'). The Latin noscere derives from Proto-Indo-European *gneh₃- ('to know'), one of the most productive roots in the Indo-European family: it gives Latin gnoscere and cognitio (cognition), Greek gnosis and gignosko, Old English cnawan ('to know'), and ultimately English know, cognition, recognize, notice, notion, noble, and ignore. Reconnaissance is, at its etymological root, the act of knowing again — going out and making oneself acquainted with a landscape, a position, or an enemy disposition so that what was unknown becomes known.

The military necessity of reconnaissance is as old as armed conflict. A commander who moves an army without knowledge of the terrain, the enemy's position and strength, and the routes of approach and retreat is operating blind — a condition that has produced catastrophic defeats throughout military history. Crassus at Carrhae (53 BCE) had no adequate reconnaissance of the Parthian force he was meeting; the French at Agincourt (1415) did not fully appreciate the boggy terrain that would immobilize their cavalry; the British at Isandlwana (1879) failed to properly scout the ground around their camp. The lesson of military history is relentlessly consistent: reconnaissance is not a preliminary to the battle but a constituent of it.

The formalization of reconnaissance as a military function developed through the evolution of light cavalry units specifically tasked with forward scouting. Hussars, Cossacks, and light dragoons in European armies of the seventeenth and eighteenth centuries performed reconnaissance as their primary mission: riding ahead of the main body, observing enemy positions, screening the army's own movements from enemy observation, and gathering the terrain knowledge that operational planning required. The Napoleonic Wars gave reconnaissance a new systematic importance, as Napoleon's extraordinary operational speed required continuous real-time intelligence about enemy positions and road conditions. His marshals competed in the quality of their reconnaissance systems.

The word entered English in the late eighteenth century, initially in military writing, and was immediately contested on spelling grounds — the French double-n and the final -ce gave English spellers fits, and variants including reconnoissance, reconnoitering (a back-formation from the verb reconnoiter, borrowed from Dutch verkennen via French), and reconnoitre proliferated. The verb 'to reconnoiter' or 'to reconnoitre' became standard in British military English; the noun 'reconnaissance' remained more French in its appearance. In the twentieth century, reconnaissance acquired the technical shorthand 'recce' in British military slang and 'recon' in American usage — practical compressions of a word that was always slightly too French for easy everyday deployment.