The "Last Post" call (2nd Post) is used in British Army camps to signal the end of day when the duty officer returns from the tour of the camp and quarters. The "First Post" call marks the start of the inspection. The names are derived from the practice of inspecting all the sentry posts around such a camp at the end of the day, and playing a call at each of them.

In addition to its normal garrison use, the Last Post call had another function at the close of a day of battle. It signalled to those who were still out and wounded or separated that the fighting was done, and to follow the sound of the call to find safety and rest. Its use in Remembrance Day ceremonies in Commonwealth nations has two generally unexpressed purposes. The first is an implied summoning of the spirits of the Fallen to the cenotaph, the second is to symbolically end the day, so that the period of silence before the Rouse is blown becomes in effect a ritualized night vigil.