Optical
The Fall of the Eleventh
Sounds like the theft of lands from Native Americans to me, but not really sure.
Well, the only thing I can think about is the formation of the State of Israel in 1948. Jews had been spread around the world for nearly 2000 years (which would account for the Over hills, through sands, / through forest and over waves), and they had lost their Promised Land. The part about massacring the locals could be a reference to the expulsion of the Arab Palestinians from current Israel and the wars between Israel and its Arab neighbours.
You win.1st Crusade
Aww, I was about to post 'William the Conqueror'
William the conqueror did just go by water. as I said to everyone before you solved it, they were supposed to take it literally.didn't he just come over the waves though..