The phrase “bulwark of” is correct and can be used in written English.
You can use it to denote strength and support in a given situation. For example, “She was a bulwark of support for her team”.
Southern whites became the bulwark of the Republican Party.
Adjudication, they successfully insisted, was a vital bulwark of liberty.
It is also the economic bulwark of a community.
The Revolution remains the last bulwark of national myth.
United States attorneys are a bulwark of the justice system.
"These are the bulwark of a strong economy moving forward".
Mr. Mubarak's fall removed a bulwark of American foreign policy in the region.
Press independence is as essential a bulwark of political liberty in Britain as it is everywhere.
Almost overnight, Victoria, once Australia's most radical and progressive colony, became a bulwark of conservatism.
"He is a stubborn character, and a bulwark of sorts," Mr. Polner said of Mr. Carey.
To gun groups, such an unfettered marketplace stands as a bulwark of their Second Amendment rights.
