Millions of people across the UK have observed a two-minute silence to mark the 93rd Armistice Day.
The event commemorates those who died in the two world wars and subsequent conflicts, including 385 UK personnel killed in Afghanistan since 2001.
After the remembrance service in Whitehall, 170 people - believed to be English Defence League supporters- were arrested near the Cenotaph.
The police said they were detained to prevent a breach of the peace.
Scotland Yard added that there had been no reports of disorder ahead of the arrests.
Trouble flared on Armistice Day last year when the English Defence League clashed with members of Muslims Against Crusades (MAC) who had burned poppies outside the Royal Albert Hall. A demonstration organised by MAC for this year's event was cancelled after the group was banned by the home secretary.
The ceremony at the Cenotaph was attended by the Chief of the Defence Staff, Gen Sir David Richards, and the professional head of the Army, Gen Sir Peter Wall, along with servicemen and women.
Prime Minister David Cameron paid tribute to British armed forces, saying they were among the best in the world.
The National Service of Remembrance, led by the Queen, will take place at the Cenotaph on Sunday.