ambushment

Thereafter let it be that our knights withdraw as though in retreat, and so lead this knight and the knights of the castle into an ambushment.

From The Story of the Champions of the Round Table by Howard Pyle

The old hunter postponed his prayerful motion, most reluctantly, as it would seem, and led the way in a silent withdrawal from the dangerous neighborhood of the ambushment.

From The Master of Appleby A Novel Tale Concerning Itself in Part with the Great Struggle in the Two Carolinas; but Chiefly with the Adventures Therein of Two Gentlemen Who Loved One and the Same Lady by Francis Lynde

I hold it a sin to kill the second buck afore the first is eaten, unless a march in the front, or an ambushment, be contemplated.

From The Last of the Mohicans A Narrative of 1757 by James Fenimore Cooper

Here is a moil, here is an ambushment!

From Standish of Standish A story of the Pilgrims by Jane G. (Jane Goodwin) Austin

So from that on we went as men whose lives are held in pawn by a hidden foe, looking at every turn for an ambushment.

From The Master of Appleby A Novel Tale Concerning Itself in Part with the Great Struggle in the Two Carolinas; but Chiefly with the Adventures Therein of Two Gentlemen Who Loved One and the Same Lady by Francis Lynde