On 10 October hundreds of UK troops arrived in The Netherlands as part of an epic 2,500km road move to Norway for Exercise Trident Juncture, NATO’s flagship exercise in 2018. In Norway, UK Armed Forces personnel will contribute to the large-scale and complex exercise which will test NATO’s most important founding principle of collective defence in an Article 5 scenario – when an attack on one is an attack on all. With some 150 aircraft, 40,000 participants and 10,000 vehicles, this is the largest collective defence exercise NATO has seen in over a decade.