Crispina - 117AD is when the Ninth disappeared, and that legion was part of Claudius' invasions of Britain. For a nifty little review of Sutcliff's novel, I'd like to point you here: The Eagle of the Ninth by Rosemary Sutcliff
And I know what you mean about the battle scenes. I actually enjoy the action...you know, kind of just letting yourself go and enjoying for the sake of itself. But those scenes become a bit repetitive. I'm not sure how unique the descriptions can be when they occur so frequently...over and over and over again. I think that's one of the reasons the first two books were particularly strong (because the battles are "new"), and why "When the Eagle Hunts" was fun (because the battles were more unique than the typical roman set-piece battles).
The characters WITHIN the battles, and drama and intrigue BETWEEN the battles, is what makes the books enjoyable.
J