Beating Retreat Ceremony , What Is?

What is beating retreat ceremony? Media is using this expression repetitively, with reference to the Wagha Border blast that rocked a couple of days ago.
Each time the media, particularly the electronic media repeats this expression, a curiosity arises, what does this ceremony imply, beat or retreat.
In my four decade long experience as a newsman, me and my colleagues like Mukutdhari Agrawal, K.P.Roy, and many others, followed one essential rule. That rule was to avoid the use of a cryptic or unintelligible or little known or little remembered term, name or reference.
Instead of feeding vagueness, we would explain the term, name or reference in simple one liners.
This simple discipline is not followed. That leaves the readers and viewers in imbecile dilemma, as most of us might be in, with reference to the above term, 'beating retreat ceremony'.
If you already know what it is, the next lines are not for you. But if you are unaware, following may be of your interest .
WHAT IS BEATING RETREAT CEREMONY?
This ceremony takes place every evening before sunset at the Wagah border, which as part of the Grand Trunk Road was the only road link between these two countries before the opening of the Aman Setu in Kashmir in 1999. The ceremony starts with
a blustering parade by the soldiers from both the sides, and ends up in the perfectly coordinated lowering of the two nations' flags.[2] It is called the beating retreat border ceremony on the international level. One infantryman stands at attention on each side of the gate. As the sun sets, the iron gates at the border are opened and the two flags are lowered simultaneously. The flags are folded and the ceremony ends with a retreat that involves a brusque handshake between soldiers from either side, followed by the closing of the gates again. The spectacle of the ceremony attracts many visitors from both sides of the border, as well as international tourists.[2]
In October 2010, Major General Yaqub Ali Khan of the Pakistan Rangers decided that the aggressive aspect of the ceremonial theatrics should be toned down.[1][3]
The ceremony has been filmed and broadcast by Michael Palin for one of his television around-the-world travel programs; he described it as a display of "carefully choreographed contempt."[2]