The funeral procession from the castle to the chapel was headed by the Band of the Grenadier Guards, the Major General's party, and military service chiefs.
The Queen, 94, travelled with a lady-in-waiting in the state Bentley at the end of the procession.
A Royal Marines bearer party carried the coffin into the service.
A reduced choir of four singers is included but the congregation will not be singing, in line with coronavirus restrictions.
Buglers of the Royal Marines sounded Action Stations - a signal that all hands should be ready for battle - as the coffin was lowered into the Royal Vault.
A ceremonial gun fire at nine locations across the UK, and in Gibraltar, marked the start and end of the national minute's silence.
Heathrow Airport said no planes would land or take off for six minutes to coincide with the silence and all major sporting events were rescheduled to avoid a clash with the funeral./bbc