1900 To 1938
The Regiment went to the Boer War as part of the Imperial Yeomanry and first saw action in May 1900. The names of those who died are commemorated on the Barras Bridge War Memorial and in the Cathedral, in Newcastle.
In 1908 the Regiment was incorporated into the newly formed Territorial Army. It was mobilised in August 1914, subsequently being the first Territorial unit to go into action against the enemy, at the first battle of Ypres. It remained on the Western front throughout the rest of the War taking part in many of the great battles. On 21 August 1918 it undertook one of the last mounted cavalry charges of that War - into Happy Valley, near Bray, on the Somme.
A Second Line Regiment saw action in Ireland and for a short period in France. A Third Line Regiment carried out training and supplied drafts.
In 1921 the Yeomanry was to be cut to 12 regiments and NH, being 14th in seniority, was at risk of being disbanded. At the end of that year the Secretary of State, (Sir) Winston Churchill, at a speech in the Mansion House said that the Northumberland Hussars was the only regiment in the Territorial Army to be fully recruited and so the Regiment would be maintained.
Between the Wars regular camps were held in places such as Alnwick, Rothbury, Hexham, and other local towns.