The francisca (or francesca) is a throwing axe used as a weapon during the Early Middle Ages by the Franks, among whom it was a characteristic national weapon at the time of the Merovingians from about 500 to 750 and is known to have been used during the reign of Charlemagne (768–814). Although generally associated with the Franks, it was also used by other Germanic peoples of the period, including the Anglo-Saxons; several examples have been found in England.
The term francisca first appeared in the book Etymologiarum sive originum, libri XVIII by Isidore of Seville (c. 560–636) as a name used in Hispania to refer to these weapons "because of their use by the Franks".
The francisca is characterized by its distinctly arch-shaped head, widening toward the cutting edge and terminating in a prominent point at both the upper and lower corners. The top of the head is usually either S-shaped or convex with the lower portion curving inward and forming an elbow with the short wooden haft. Sometimes the head is more upswept, forming a wider angle with the haft. Most franciscas have a round or teardrop-shaped eye designed to fit the tapered haft, similar to Viking axes. Based on the measurements of modern replicas, the francisca had a haft length of around 40–45 cm (16–18 in) and a 10 cm (4 in) cutting edge  with an average weight of around 600 g (21 oz, 1.3 lb). Based on the surviving heads of franciscas recovered at Burgh Castle and Morning Thorpe in county Norfolk, England, the length of the head itself measured 14–15 cm (5–6 in) from the edge to the back of the socket.
...each man carried a sword and shield and an axe. Now the iron head of this weapon was thick and exceedingly sharp on both sides while the wooden handle was very short. And they are accustomed always to throw these axes at one signal in the first charge and thus shatter the shields of the enemy and kill the men.
Procopius makes it clear that the Franks threw their axes immediately before hand-to-hand combat with the purpose of breaking shields and disrupting the enemy line while possibly wounding or killing an enemy warrior. The weight of the head and length of the haft would allow the axe to be thrown with considerable momentum to an effective range of about 12 m (40 ft). Even if the edge of the blade were not to strike the target, the weight of the iron head could cause injury. The francisca also had a psychological effect, in that, on the throwing of the francisca, the enemy might turn and run in the fear that another volley was coming.
A distinctive feature of the francisca was that, when thrown in a way that it impacted the ground in front of the opponent, it would bounce in an unpredictable arc towards him while spinning furiously. It was a practical possibility in using the axe, one that could cause considerable distress to the enemy (making dodging or blocking it difficult) and made it unique among handthrown weapons of war.
- Tarassuk, Leonid; Blair, Claude (1982). The Complete Encyclopedia of Arms and Weapons: the most comprehensive reference work ever published on arms and armor from prehistoric times to the present with over 1,250 illustrations. Simon & Schuster. p. 186. ISBN 0-671-42257-X.
- Underwood, Richard (1999). Anglo-Saxon Weapons and Warfare. p.35-37. Tempus Publishing. ISBN 0-7524-1910-2.
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