Excerpts from Books and Wikipedia
"When the Sea Peoples were defeated by Pharaoh Rameses III of Egypt, the Pelesata (Philistines) settled in the Promised Land as vassals or mercenaries to garrison Egyptian posts." [Historical Atlas of Judaism, p. 46]
"With the death of Ramses III, the true glory of the Egyptian New Kingdom came to an end. There would be eight more pharaohs during the Twentieth Dynasty before it ended in 1070 BC, but none of them accomplished anything of merit." [1177 BC, Kindle, Location 2713] "Between 1185 and 1070 BC, Rameses III defeats the Sea People, but Egypt declines." [Bauer: Ancient World, p. 275]