"Into the valley of Death": this Biblical imagery portrays war as a supremely powerful, or even spiritual, experience.
"Jaws of Death" and "mouth of Hell': presents war as an animal that consumes its victims.
'Honour the Light Brigade/Noble six hundred" language glorifies the soldiers, even in death. The 'six hundred' become a celebrated and prestigious group.
"shot and shell": sibilance creates whooshing sounds of battle.