Who Were the Sea Peoples?

I took a long walk today, and didn't see a single sign that just a couple of decades ago, this city was a battleground. I must research further. Tomorrow, my plan is to do a pub crawl. At each stop, I will alternately sing "Do you want a chicken sandwich Bobby Sands?" and "Ian Paisley Wears Nuns Undergarments." If I live, we can declare the troubles officially over.