there was the better part of two full cohorts-or , she supposed the legion 's prime cohort-turned out in ranks in front of the coach , while at least five times as many legionares were obviously on duty within sight of her position , on guard upon the battlements at the edges of the wall , at each level of the ramparts , and at lighted positions up and down the length of the wall , to either horizon , as far as she could see .