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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Pictures from the commemoration marking the centenary of the Quintinshill rail disaster, which killed more than 200 people, is underway.
The 100th anniversary of Britain's worst rail disaster will be commemorated at a special service today.