Because there was no recording of the video materials at that time, Jackson found a lip-talker and showed them the segments of the soldiers' conversation in the movie. The lip-talker fed back the content of the conversation to the crew, and the crew invited actors from specific areas in the UK. Dubbing
.
The sound engineer collected shell explosions, footsteps in the mud, the click of gun bolts, and the sound of horseshoes to re-dubb the screen
. In order to restore the sound of guns on the battlefield, the crew specially found weapons and equipment from the First World War, which were operated and sampled by sound effects engineers, such as the short magazine type "Lee Enfield" NO.1 MK used by the British infantry in the film. The shooting sound of the 3 type 7.7mm rifle is completely operated and recorded with real guns, and then dubbed the film
.
