This quote is about burying the soldiers, it could be presenting literal death; the men they are burying have died quickly due to being 'half-known' , or the men have decided not to get to know each other as personal attachments are not good for your emotional health in the war, as you would gain a psyhological attachment to them so if they died then it would affect you largley. This idea is supported by the idea of the burial party having eyes like 'ice' because war has taken away the empathetic qualities of war. But also the idea of 'half - known' faces could be due to the masses of people dying, going into and coming out of the camps everyday. 'Their eyes are ice', the soldiers may have died with open eyes and the cold weather has made them frozen like ice cubes. Also 'but nothing happens' suggests he wants a political change or a release from war through death.