If you have been in Cumbria and southern Scotland recently, you can't fail to have noticed a lot of military activity.
Thousands of troops from around the world are taking part in a huge military exercise called Operation Joint Warrior.
Hannah McNulty went to see them in action:
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29-year-old Matt Campbell collapsed after running 22.5 miles. He received medical treatment at the scene, but died later in hospital.
Kerrie brings you Sunday night's forecast
We're back to average April weather for the week ahead