The phrase "allied for years" is correct and usable in written English.
It can be used to describe a long-standing partnership or alliance between individuals, groups, or organizations.
Example: "The two companies have been allied for years, working together on various projects to achieve mutual goals."
Alternatives: "partnered for years" or "joined forces for years".
This was the day, those 70 years ago this week, when the British army, still at war with Germany, opened fire upon – and gave locals who had collaborated with the Nazis the guns to fire upon – a civilian crowd demonstrating in support of the partisans with whom Britain had been allied for three years.
That movement is unsettling some drilling foes who have allied themselves for years with Democrats to keep an annual ban on oil leasing and drilling off the Atlantic and Pacific coasts and in the Gulf of Mexico off of Florida.
Cyber espionage operations have been observed against critical infrastructure in the United States and allied countries for years.
But where were we? Syria has not been our ally for years, to say the least.
The United States has been pressing its European allies for years to improve their military forces.
As governor, Mr. Bush has often worked with Democratic legislators; Mr. Junell has been an influential ally for years.
All of these people have been systematically targeted by the Syrian regime and its allies for years.
In political terms, this was a defeat for the campaign that's been waged against multilateralism by the U.S. and its allies for years.
Second, we have been allowing a double game to go on with our Middle East allies for years, and that has to stop.
The two men have been allies for years, with Mr. Fossella serving as a chairman on the mayor's 2005 re-election campaign and Mr. Bloomberg giving him money and playing host to fund-raisers at his Upper East Side town house, despite Mr. Fossella's high marks from the National Rifle Association, Mr. Bloomberg's nemesis in his war on illegal firearms.
