The "First Post" call signals the start of the duty officer's inspection of a British Army camp's sentry posts, sounding a call at each one. The "Last Post" call originally signalled merely that the final sentry post had been inspected, and the camp was secure for the night. 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.