This is pretty confusing, really. Right now I don't have much of a clear idea, although I keep thinking along certain lines - the question is, whether it's right direction or not. The "East to West" part really confuses me the most, or ruins most of my ideas, because it seems like it is pointing at the correct answer rather clearly, but its purpose avoids me. (I mean, if the answer could be "The Golden Company", it would have been easier
)
Okay, let's start with random shot in the dark, then - Osgiliath? (I am pretty sure that's not it, but at least could help to see if it's somehow around the correct line of thinking. Osgiliath, of course, could imply on the Gondorian soldiers to "keep"it and "not to leave" it, even though it's been practically destroyed - scarred etc; but the "bringing" and "not being happy" does not sound very fitting in that context. Listing the successes "from East to West" could somehow hazily refer to Mordor's conquests - from East to[wards] West; I also think here it would be stretching it a bit. Watching the water could be literal in the case of Osgiliath, given its geographic position, but again, if it was Osgiliath, I would have perhaps expected something more direct...)