The phrase "a mobilization of" is correct and usable in written English.
It can be used when referring to the act of organizing or rallying resources, people, or efforts for a specific purpose or goal.
Example: "The organization announced a mobilization of volunteers to assist with disaster relief efforts."
Alternatives: "an organization of" or "a gathering of".
A mobilization of that size was extremely persuasive.
But Palestinian leaders proclaimed that the Israelis had declared war on them and called for a mobilization of guerrilla fighters.
Weekend, a mobilization of volunteers in hundreds of projects all over the city.
One would be a mobilization of militant groups, whether Hezbollah in Lebanon or Palestinian militants in the West Bank, to carry out concerted attacks.
The times cry out for a mobilization of at least a million people, as have marched in New York before at other critical moments in our history.
The result was a mobilization of the garrison of Paris and the drafting into the city of ten additional regiments of infantry and two of cavalry.
The movement against the international financial organizations is in some ways less a mobilization of the masses than a convention of citizens groups that have individual agendas, fund-raising campaigns, and, in many cases, leaders with large egos.
What is also needed is a mobilization of ordinary people, in the U.S. and beyond, who are committed to the idea of stopping these insane outbreaks of violence and terror all around the globe.
President Omar al-Beshir said he had demanded an explanation from Eritrea on a mobilization of forces across the border from Kassala state, whose capital was invaded by rebels this month.
Hoping to recapture the spirit of pioneering young Communism, Khrushchev announced a mobilization of the young to "virgin" Kazakhstan, which was to become the granary of the Soviet Union.
Helicopters shuttled back and forth, part of a mobilization of some 100,000 troops, the largest in Japan since World War II, to assist in the rescue and relief work.
