The estoc is a sword with no cutting edges: a stiff spike of square or diamond section, made to thrust into the gaps of plate armour.
An estoc is a sword built for one purpose: to thrust through a gap in armour. It has no cutting edges. The blade is a rigid spike of square, diamond or triangular section, thick at the hilt and tapering to a needle point.
It exists because of plate armour. Once a harness could turn any cut, the sword either found a way to defeat it or became irrelevant, and the estoc is the most literal answer available — a sword that gives up cutting entirely in exchange for a point stiff enough to be driven home.
It is called the tuck in English and the Panzerstecher — "armour-stabber" — in German, and the German name describes the weapon better than either of the others.
The blade runs ninety to a hundred and twenty centimetres and is thick through its section rather than wide across it. A diamond or square cross-section resists bending in every direction, which is exactly what a thrust into steel requires.
There is no fuller and no edge. The faces meet at ridges rather than at a sharpened edge, and a blade of this kind cannot cut at all — a fact that surprises people who assume every sword is a cutting weapon with a point attached.
Hilts vary with the role. Cavalry versions are one-handed with a simple cross; infantry versions have a long grip for one and a half hands and often a ricasso, a blunt section above the guard, to be gripped in half-sword.
On foot it is used in half-sword: one hand on the grip and one on the blade, the point steered into a visor, an armpit or the inside of an elbow. It is handled far more like a short spear than like a sword.
Mounted, it is carried at the saddle as a secondary weapon and drawn after the lance is gone. Against an armoured opponent at close quarters a rigid point delivered with the horse behind it is the most effective thing a rider can offer.
It belongs to the same tactical world as the poleaxe, the war hammer and the rondel dagger — the fifteenth-century family of weapons designed around the single problem of an opponent in a good harness.
Its strength is rigidity. A well-made estoc will not flex when its point meets steel, so the full force of the thrust arrives at the tip rather than being lost in the blade bending aside.
Its weakness is total specialisation. Against an unarmoured opponent it is much worse than an ordinary sword: it cannot cut, it cannot threaten on the draw, and every attack must be a thrust.
It is also awkward to wear. Long, straight and rigid, an estoc does not hang well at the hip, which is a large part of why it is so often shown slung from the saddle instead.
It appears in the fourteenth century as plate spreads, and the timing is the same as for the rondel dagger and the poleaxe — the weapon exists because the target changed.
The fifteenth century is its European high point, when it is standard equipment for men-at-arms fighting both mounted and on foot across France, the Empire and Central Europe.
In Western Europe it fades with the armour that justified it. In Poland and Hungary it does not: the koncerz remained hussar equipment into the seventeenth century, carried under the saddle flap long after Western cavalry had abandoned the type.
French and English usage — estoc, tuck — tends to describe the longer, hand-and-a-half infantry form used in half-sword.
German practice gives the clearest name and some of the most developed examples, and the Panzerstecher is well represented in Central European collections.
The Polish and Hungarian koncerz is the longest-lived branch: a very long, narrow cavalry thrusting sword carried by hussars, and the direct descendant of the medieval estoc.