The "
First call" call signals the start of the duty officer's inspection of a
British Army camp's
sentry posts, sounding a call at each one. First published in the 1790s, the "Last Post" call originally signalled merely that the final sentry post had been inspected, and the camp was secure for the night. 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 ritualised night vigil. The "Last Post" as sounded at the end of inspection typically lasted for about 45 seconds; when sounded ceremonially with notes held for longer, pauses extended, and the expression mournful, typical duration could be 75 seconds or more. The difficulty of hearing drumbeat signals over the noise of gunfire led to the gradual introduction of the
bugle, an instrument used by the
Hanoverian Army, during the reign of King
George III. The bugle was found especially useful for the mobile tactics of the
light infantry and the newly formed
King's Royal Rifle Corps in the
American War of Independence. A number of different systems were introduced across various parts of the army, and in 1798, James Hyde, a trumpeter in the
Royal Opera House and a trumpet-major in the local
Volunteer Corps, was asked to "revise the trumpet and bugle soundings, and to reduce them to uniformity, which is hereafter to be strictly observed in all regiments and corps of cavalry in His Majesty's service". The result was published in the same year as
The Sounds for Duty and Exercise. Hyde was dissatisfied with this edition and in 1799, produced another version with an additional chapter entitled "The Bugle Horn Duty for the Light Infantry as used by the
Foot Guards"; this included the first known score for the Last Post, under the title of "Setting the Watch". It is likely that Hyde used an amalgamation of existing calls; suggestions that the melody was inspired by
Joseph Haydn lack any direct evidence. ==Memorial usage==