Primus in armis, 'first in arms', is the motto of the Royal Wiltshire Yeomanry, Britain's senior Regiment of volunteer cavalry raised in 1794 against the threat of French invasion. The Wiltshire Yeomanry has served for over 200 years and fought in South Africa, the First and Second World Wars and more recently as individuals in the Balkans, Iraq and Afghanistan. Many of the places where the Regiment fought in the Second War will be familiar to modern readers including Aleppo, Palmyra, Baghdad, and more bizarrely, meeting the Russian army on friendly terms in Tehran. The battle of El Alamein in the western desert was possibly their finest hour. The author has accessed the extensive Regimental archives and interviewed many families of veterans to obtain a glimpse into the personalities of these soldiers. A wealth of unseen material from around the world has surfaced including stories concerning the aristocracy of the inter-war years and the previously forgotten service of the Regiment's most famous officer. This first, illustrated history of 'The Royal Wilts' will appeal to anyone with an interest in the British Army.