A Question about Egyptians in the Bible

[Lorenzo]

I just had a question about one particular excerpt in the bible that always puzzles me.
Why did Ramses II, Pharaoh of Egypt, charge towards the Hebrews when Moses set the plagues to Egypt? Why did Ramses charge when he, with his troops, witnessed the opening of the Red Sea as well as the creation of the Tornado of Fire?

Why did he do this?

Please, someone explain to me.