Which preposition to use with mantelets

of Occurrences 2%

Ever as they clomb, the path grew more difficult, until at last they were come to a parapet or outwork with mantelets of osiers beyond, cunningly wrought, above which a pike-head glimmered and from beyond which a voice challenged them; but at a word from Eric the sentinel stood aside and behold, a narrow opening in the parapet through which they passed and so up another path defended by yet another parapet of osiers.

for Occurrences 1%

Thus, would I attack a city, I do it modo et forma: first, I set up my mantelets for my archers, and under cover of their swift shooting I set me up my mangonels, my trebuchets and balistae: then, pushing me up, assault the walls with cat, battering-ram and sap, and having made me a breach, would forthwith take me the place by sudden storm.

Which preposition to use with  mantelets