A final ceramic poppy has been "planted" at the Tower of London.
Volunteers have spent months installing 888,246 hand-made poppies - each representing a British and colonial soldier who died during WW1.
It is thought about five million people have visited the artwork entitled Blood-Swept Lands and Seas of Red by ceramic artist Paul Cummins, from Derbyshire.
Berkshire cadet Harry Hayes, 13 "planted" the final poppy.
The final names from the Roll of Honour were read out and the guns fired 21 times before the silence.
The title of the work was inspired by a line from the will of a Derbyshire serviceman who died in Flanders.
He described "the blood-swept lands and seas of red, where angels fear to tread".
General the Lord Dannatt, Constable of the Tower of London, said an estimated five million people had been to see the poppies.
The former head of the British Army said: "The great thing about it is that people are engaged with this.
"I think they have taken ownership of it and the reason why I think they have done that is that specific number, 888,246 - not a random number - that is the number of British and Colonial soldiers who lost their lives in the First World War.
"Every poppy represents a life lost and a family shattered."
He said 17,500 volunteers had planted poppies while a team of about 8,000 volunteers would start dismantling the installation on Wednesday.
The weeping window and wave segments of the installation will be the final sections to be removed and will be on show until the end of the month.
Thousands of the poppies will then go on tour before being permanently based at the Imperial War Museums in London and Manchester.
The prime minister said the display had "in a very short space of time become a much-loved and respected monument".
The poppies have been sold for £25 each with all net proceeds plus 10% of every sale being shared between six service charities, including Help for Heroes and the Royal British Legion.
It is thought the sales could raise in excess of £15m.
World War One Centenary