The phrase "a decisive intervention" is correct and usable in written English.
It can be used to describe an action taken that has a significant impact on a situation or outcome.
Example: "The government made a decisive intervention to stabilize the economy during the crisis."
Alternatives: "a critical intervention" or "a pivotal intervention".
It was a decisive intervention.
Earlier, replacement Ben Hunt made a decisive intervention after England dominated the opening 40 minutes.
In a best-case scenario, he could be the unheralded player who makes a decisive intervention in the group stages.
I think that was a decisive intervention in terms of Birmingham not suffering tension and violence between communities".
Vince Cable, their Treasury spokesman and deputy leader, is said to have made a decisive intervention at last night's meeting of the Lib Dem parliamentary party.
Samir Shah, former BBC non-executive director and chief executive of independent production company Juniper, said it was "time to make a decisive intervention".
The difference may seem trivial, but the implications for intervention are not, because targeting a co-conspirator implies a more decisive intervention than targeting a pawn.
He was at his instinctive best, mentally sharp and agile, making a startling and decisive intervention into the multi-passing movement of that first great try of which he was also the scorer.
Against this threat, after the destruction at Truk, the Japanese hastily drew up a new defense plan, "Operation A," relying on their remaining 1,055 land-based aircraft in the Marianas, in the Carolines, and in western New Guinea and on timely and decisive intervention by a sea force, which should include nine aircraft carriers with 450 aircraft.
The decisive intervention on an evening illuminated by the brilliance of Brazilians on both sides and a goal from a Spanish golden boot winner was provided by a talent nurtured across the Thames in south London.
Due to the decisive intervention of India, a joint Bangladeshi-Indian taskforce was making rapid advances on Dhaka, The West Pakistani regime knew that Bangladesh's independence was inevitable.
