The phrase "assembling force" is correct and usable in written English.
It can be used in contexts related to gathering or mobilizing resources, people, or elements for a specific purpose or action.
Example: "The team focused on assembling force to tackle the upcoming project, ensuring all necessary skills and resources were in place."
Alternatives: "mobilizing resources" or "gathering strength".
On Friday morning in the White House situation room President Bush turned to Gen. Richard B. Myers, the chairman of the Joint Chiefs of Staff, and asked, "Dick, is Tommy Franks ready to go?" He was referring to the crusty Army general who commands the American military in the Middle East and South Asia, and who was rapidly assembling forces for the coming war in Afghanistan.
The Byzantines tried to take advantage of the revolt, and began assembling forces at Messina and Reggio, while a fleet was dispatched from Constantinople.
As Commander-in-Chief, Jackson was responsible for assembling forces for the 2000 British intervention in Sierra Leone, which included Brigadier David Richards later Chief of the Defence Staff and Jackson's son Mark.
But there have long been concerns about the durability of such a rapidly assembled force.
They have about 5,000 battle-hardened troops in and around the town, against Sayed Jaffar's newly assembled force, estimated at 700.
On the Confederate side, Johnston named his newly assembled force the Army of Mississippi.
Spotting a weak point, one of the SS battalion commanders, Obersturmbannführer Hilmar Wäckerle, suddenly attacked with a hastily assembled force of about company strength.
Commodore Josias Rowley was given command of the British response to the French deployment, a hastily assembled force composed mainly of those ships available at the Cape of Good Hope in early 1809.
To achieve this effect, Sir Colin drove his assembled forces unusually hard.
At Thursday's opening, these assembled forces gave a thrilling reading of this modernist blockbuster, written in 1946.
