tenaille

/ (tɛˈneɪl) /

fortifications a low outwork in the main ditch between two bastions

Word Origin for tenaille

C16: from French, literally: tongs, from Late Latin tenācula, pl of tenaculum

For a dry and level site he recommended a bastioned trace; but for wet ditches and for irregular ground, tenaille traces.

Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 |Various
Two were placed in the tenaille of the castle, and two were kept in reserve.

Annals of a Fortress |E. Viollet-le-Duc
Tenaille bastion: Used when the flanked angle is too acute; that is, less than 70.

Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 |Various
The “tenaille” system and the “polygonal” system which grew out of it are mainly identified with the German school.

Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 |Various

De Groote, who wrote in 1618, produced a sort of tenaille system, and may have been the inspiration of Rimpler.

Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 |Various