The Hertfordshire Militia was an auxiliary military force in Hertfordshire in South East England. From their formal organisation as Trained Bands in 1558 and their service in the English Civil War, the Militia of Hertfordshire served during times of international tension and all of Britain's major wars. They provided internal security and home defence but sometimes operated further afield, including Ireland, relieving regular troops from routine garrison duties, and acted as a source of trained officers and men for the Regular Army. Under the Cardwell Reforms they were linked with the neighbouring Bedfordshire Regiment and went on active service during the Second Boer War. The Militia were converted into the Special Reserve under the Haldane Reforms of 1908 intended to supply reinforcement