Troops from Catterick Garrison prepare to undertake peacemaking mission in South Sudan.
The troops will serve as engineers in the country, which has been ravaged by conflict, famine and disease in recent years.
The deployment of 162 British personnel from Catterick will increase the number of UK military in country to around 400.
They are part of a British contingent aiding a wider UN peacekeeping force.
Some troops have left already.
International Development Secretary Priti Patel has visited members of 32 Engineer Regiment at Catterick Garrison in Yorkshire, as they prepare to deploy.
The troops will primarily be split between Malakal and Bentiu in the north of South Sudan. There they will provide engineering and medical support at UN camps and help to develop logistical routes to improve the delivery of humanitarian aid.
The work is vital in a country where movement by road is almost impossible due to a lack of infrastructure.
In South Sudan 6 million people face the daily reality of going without enough food and water.
Nearly 4 million people have been forced from their homes because of ruthless violence and widespread sexual assault.
Jonny Blair reports: