I'll get the analysis up now
Basically I was looking for those two hill tops to the west, but I saw another one which wasn't marked, and I assumed that was the east hill. Then I didn't look at my map well enough to see that there was a larger hill that should've been easily visible.
It all happened because I didn't focus enough on a plan and keep track of where I was going. There was also a river where I got mixed up in.