"The first battlefield is the rewriting of History!” ~ Karl Marx.
To capture a nation, you must take control of its culture. Culture is founded on history. If you rewrite a nation’s history, you acquire the power to radically transform the culture of its people. The population of a nation whose history has been rewritten is easily persuaded—they will give up their Gods, their religion, their traditions, and their habits without too much struggle, and accept a new way of life.
A military conquest is not enough to subdue a nation, especially if the nation possesses an ancient culture. Only cultural conquest can ensure long-term subjugation. The strategy of capturing a nation by imposing a new history (culture, religion, and habits) on its people has been used with great success by the monotheistic semitic faiths in the last 1500 years.