According to the Royal Household:
Over 1400 parading soldiers, 200 horses and 400 musicians come together each June in a great display of military precision, horsemanship and fanfare to mark The Queen’s official birthday.
The streets are lined with crowds waving flags as the parade moves from Buckingham Palace and down The Mall to Horse Guard’s Parade…
After the military bands have performed, the escorted Regimental Colour, or flag, is processed down the ranks of soldiers.
Her Majesty is then joined by other Members of the Royal Family on the balcony at Buckingham Palace to watch a fly-past by the Royal Air Force.
To read the entire post by the Royal Household, please click here.