Helen Skelton is on a cycle ride across northern France to commemorate 100 years since the Battle of the Somme. She finds out about the brave cycling battalions that travelled from many parts of rural Britain, to fight there. Helen also meets fellow riders to hear their personal reasons for taking on the cycling challenge. Plus a look back through the Countryfile archives to the times Britain's countryside connections to war and the role of nature in remembrance and rehabilitation were explored. John Craven reveals the role of the humble tractor in the development of the tank, Ellie Harrison experiences the tranquillity of the National Memorial Arboretum and Jules Hudson witnesses the impact of the outdoors on one soldier's recovery from war