Meet Nimrod, a typical horse in the Household Cavalry Mounted Regiment. He's big, black and brave, yet steady as a rock. But what's his story, and how is he trained for his special military role? The Household Cavalry is a uniquely British institution, famous around the world for its outstanding pageantry and gallantry on the battle field. Its 250 horses, known as Cavalry Blacks, are central to its existence, and visitors to London flock to see these magnificent horses taking part in ceremonies and routine guarding activities. Little is known about how they are chosen, trained and what their duties - as full members of their regiment - entail. Here in words and pictures Juliet Blaxland fills in the background to their life and work, providing a fascinating insight into the world of the Household Cavalry horse.