What does defilading mean?
Defilading is a military term describing the practice of shielding soldiers, weapons, or fortifications from enemy observation and fire by exploiting natural terrain features. A position is said to be 'in defilade' when it lies hidden behind a ridge, embankment, or slope that blocks hostile lines of sight and prevents fire from sweeping along its front. The word derives from French défiler, meaning to march in single file or to screen one's movement, and it entered English through military usage alongside its close relative 'defilade.' Defilading was especially important in artillery tactics, where gunners sought hollows and reverse slopes that concealed batteries from enemy spotters while still permitting effective fire. Today the term survives mainly in historical accounts, tactical manuals, and specialist discussions of fortification, carrying connotations of professional craft, prudence, and the enduring importance of ground in warfare.
nounThe act or practice of shielding troops, weapons, or positions from enemy observation and fire, especially by placing them behind natural features such as ridges or embankments so they are protected from fire delivered along their line of front.
- The act of positioning troops, guns, or fortifications behind natural cover so as to protect them from enemy observation and direct or enfilading fire.
"The artillery battery survived the bombardment thanks to careful defilading behind a low ridge."
"Good defilading placed the machine-gun nests below the crest of the hill, invisible to enemy observers."
"The manual devoted an entire chapter to the defilading of field artillery against counter-battery fire."
Rarely pluralized; the word normally functions as an uncountable mass noun referring to the general practice or act of shielding a position.
"The treatise compared various defiladings employed across different terrains."
A ridge can be worth more than armor plate — defilading is how soldiers hide entire batteries in plain sight.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of defilading
Defilading comes from the French verb défiler, formed from dé- ('removal' or reversal) plus file ('line' or 'column'), originally meaning to march in single file or to pass along a narrow passage. In military English, it developed the sense of screening a position out of the enemy's line of fire, giving rise both to the verb 'defilade' and the noun 'defilading'. It shares this root with 'defile' (a narrow gorge) and with 'enfilade', which describes fire running down a file or line — the opposite condition that defilading guards against. The word became established in English military vocabulary during the era of formal siegecraft and field-artillery doctrine.
Related word forms
How defilading is actually used
A technical term of military engineering and gunnery, now largely historical or confined to specialist literature on fortifications and tactics. It appears chiefly in formal or scholarly writing about warfare rather than everyday speech.
Easily confused with defilading
Enfilading means raking a position with fire along its length — the very thing defilading protects against.
Defiling most commonly means making dirty or contaminating; defilading is purely a military term for protecting positions from enemy fire.