3 adjectives to describe sangars

Our men had to advance across ravines and beds of watercourses covered with large stones, and up the wooded slopes of hills where stone walls constituted ready-made sangars easily capable of defence.

As soon as we topped the swell of the ground, we saw the enemy bolting in twos and threes from the nearest sangar, now about two hundred yards off, and presently there came a rush right across our front.

A good deal of discussion went on as to whether the enemy's main defence was on the left bank, in which case we should have to attack across the river, or on the right bank, in which case the present visible sangar was a flanking bastion.

3 adjectives to describe  sangars