I have thought of a tenaille -- of a flat bastion.    From Wordnik.com.  [Fort Amity] Reference

In fact governor Stuyvesant, like the celebrated Montalembert, held bastions in absolute contempt; yet did he not like him substitute a tenaille angulaire des polygons à ailerons.    From Wordnik.com.  [A History of New York] Reference

Platforms, of a tenaille form, for our cannon.    From Wordnik.com.  [Voyages of Samuel De Champlain — Volume 02] Reference

"We should be grateful it's not a tenaille trace.    From Wordnik.com.  [Sharpe's Siege]