Barnsley Council says it put its emergency and business continuity plans to the test in October to help strengthen the borough's preparedness for major incidents.
The exercise, called Exercise Willow Grove, brought together 116 colleagues from across the council, the authority says.
The council says the aim was to check how well its plans would hold up in a major incident and to strengthen Barnsley's readiness.
The authority has shared news of the exercise on its own website.
