Guns fired a royal salute in Hyde Park on Monday to mark the birth of the Duke and Duchess of Cambridge’s new daughter (and Prince George’s new sister), named Princess Charlotte Elizabeth Diana (or more formally, Her Royal Highness Princess Charlotte of Cambridge). Seventy-one horses pulling six World War I-era 13-pounder field guns from the King’s Troop Royal Horse Artillery rode out in procession with the Royal Artillery Band from Wellington Barracks, past Buckingham Palace, up Constitution Hill to Wellington Arch, and into Hyde Park to fire the salute. The 41 gun salute was fired at the same time as a 62 gun salute at the Tower of London. By custom, gun salutes are fired for the birth of every prince or princess, regardless of where they sit in the order of succession. A basic salute is 21 rounds with an additional 20 rounds fired because Hyde Park is a Royal Park while at the Tower of London an extra 20 rounds are fired because it is a royal palace along with a further 21 because of its City of London location. The princess, fourth in line to the throne, was born at 8:34am on Saturday at St Mary’s Hospital in Paddington, and weighed 8lbs, 3oz (3.7kg). PICTURE: © Courtesy of Ian Wylie Photo.