Queen Elizabeth II's funeral: Prince William, Harry walk side-by-side to honour Queen

Prince William and Prince Harry reunited to walk side-by-side behind their grandmother Queen Elizabeth II's coffin as it left Buckingham Palace on September 14. Along with King Charles, the brothers and other members of the Royal Family took part in the procession from Buckingham Palace to Westminster Hall, where the Queen's body will lie in state for four days until her funeral.

Twenty-five years after capturing the hearts of the world when they walked behind their mother Diana's coffin, princes William and Harry again helped lead the most poignant of processions. Credit: Reuters Photo

This time, the estranged brothers were reunited in grief with the royal family as they honoured their grandmother Queen Elizabeth II. Credit: AFP Photo

Prince William, Prince of Wales, Catherine, Princess of Wales, Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex pay their respects inside the Palace of Westminster during the lying in state of Queen Elizabeth II in London. Credit: Reuters Photo

Members of the Royal Family march during a procession where the coffin of Queen Elizabeth II is transported from Buckingham Palace to the Houses of Parliament for her lying in state, in London. Credit: Reuters Photo

Under mournful funeral marches by Chopin, Beethoven and Mendelssohn -- played by the bands of the Scots Guards and the Grenadier Guards -- her coffin was taken in full pomp to lie in state at Westminster Hall. Credit: Reuters Photo

The late Queen's custom-made lead-lined English oak casket was adorned with the Royal Standard flag, the Imperial State Crown on a velvet cushion and a wreath of flowers. Credit: AP Photo

Prince William, Kate, Princess of Wales, Prince Harry, and Meghan, Duchess of Sussex leave after paying their respects to Queen Elizabeth II in Westminster Hall for the lying in state in London. Credit: Reuters Photo

Britain's William, Prince of Wales and Prince Harry march during a procession where the coffin of Britain's Queen Elizabeth is transported from Buckingham Palace to the Houses of Parliament for her lying in state in London. Credit: Reuters Photo

Prince William, Prince of Wales, Prince Harry, Duke of Sussex and Peter Phillips walk behind the coffin of Queen Elizabeth II during a procession from Buckingham Palace to the Palace of Westminster, in London. Credit: AFP Photo

Prince William, Prince of Wales, Sir Timothy Laurence, Prince Harry, Duke of Sussex, King Charles III, Peter Phillips, Anne, Princess Royal walk behind the coffin during the procession. Credit: Reuters Photo