The day aims to honour the Armed Forces and remember the 1962 India–China War.
On 20 October 1962, China launched attacks against India in NEFA (North-East Frontier Agency), now Arunachal Pradesh, and Ladakh, marking the beginning of the war.
The war was fought mainly in the eastern sector (NEFA) and western sector (Ladakh, including Aksai Chin).
China announced a unilateral ceasefire on 21 November 1962, ending the major fighting.
In 1966, a national committee set up during Prime Minister Indira Gandhi’s tenure designated 20 October as National Solidarity Day.
The day honours the soldiers who sacrificed their lives and promotes national unity, patriotism and solidarity.