Ambulance workers are to stage a 24-hour strike in a long-running row over issues including cuts.
Unite said its 450 members in the Yorkshire service, including paramedics and other staff, will walk out on 2 April and ban overtime from 26 March.
The union warned that further strikes could be held.
Unite said the Yorkshire Ambulance Service NHS Trust had derecognised the union after it raised concerns about patient safety over plans to make £46 million of savings over the next five years.
Union members voted by 61% in favour of strikes and 83% for other forms of industrial action.
More top news
Police are looking for witnesses of a crash in Sunderland which left a man with serious head injuries.
A 14-year-old boy has been seriously injured in a collision in Ripon this morning.
School leavers from the North East are some of the least likely to go to university in England, according to new research.