The phrase "union of forces" is correct and usable in written English.
It usually refers to a situation in which a group of people or organizations come together in order to achieve a common goal. For example, you could say, "The union of forces between the two countries was essential in bringing about peace in the region."
Mr Nouri told Reuters news agency that his Union of Forces for Democracy and Development UFDDD) fighters were going to "progress slowly to N'djamena".
The president of Togo, 43-year-old Faure Gnassingbé, won reelection on March 4, 2010, taking nearly 61% of the vote against 34% for his nearest rival, Jean-Pierre Fabre of the opposition Union of Forces for Change (UFC).
Gnassingbé, again standing as the candidate of the long-time ruling party, the RPT, was said to be the winner by a large margin over his closest opponent, but the main opposition group, Union of Forces of Change (Union des Forces du Changement; UFC), disputed the outcome.
There is also a Tantric mantra-yoga (discipline through spells), which operates with formulas, and a hatha-yoga, (Sanskrit: "union of force").
Seleka is a reference to fighters from three groups - Union of Democratic Forces for Unity (UFDR), the Union of Republican Forces (UFR) and the Convention of Patriots for Justice and Peace CPJPP) - coming together to launch the rebellion.
The opposition – principally Cellou Dalein Diallo's Union of Democratic Forces of Guinea and Sidya Touré's Union of Republican Forces – is concerned about possible fraud.
Its closest challenger, Cellou Dalein Diallo's Union of Democratic Forces of Guinea, came second, with 37 seats.
We are satisfied," said Oury Bah, vice president of the political party Union of Democratic Forces in Guinea.
His influence on the ruling Union of Democratic Forces (UDF), on the reforming right, has been beneficial.
The Union of Rightist Forces, led by Chubais, Sergei Kiriyenko and other reformers, embraced Putin and scored quite well with 8.6%.
He joined the Istiqlal Party, becoming speaker of the National Consultative Assembly, and in 1959 left the party to found the left-wing National Union of Popular Forces (UNFP).
