When I was about 8, we went to London, and went to see the changing of the guard at Horseguards. In those days, things were more relaxed (we went on to pose outside 10 Downing Street), and the crowd just gathered around the square that opens onto Whitehall. As the ceremony was in full swing, a middleaged couple (American I think but I don't know if I heard them speak or what) wandered through from the direction of Horseguards Parade and into the middle of it all.
The officer in charge of the current guard broke ranks on his mount, walked it over to them, drew his sword and demanded they get out of the way, which they did, swiftly.
Forget the shiny costumes and the plumes - under them are real soldiers, on bloody great horses. Warfare may have adopted the tank, but a man on a big horse is still a force to be reckoned with.
It's like when that chap fired a blank at the Queen during Trooping the Colour - he was tackled by a Grenadier Guard in full regalia. Wearing a slightly poncy fur hat doesn't make a soldier any less able to land a decent punch!