Two enormous hills were surrounded by walls ingeniously built so as to project or slope inwards and thus leave the flanks of an attacking party exposed to fire. The rocks were jagged at the top.
Izan ere, garaiera itzelean goratzen ziren bi muino harresi artoski zehiarrek edo barrurantz angeludunek ixten zituzten, erasotzaileen aldamenak tiropean gelditzen zirela.