On passing the new menin gate paragraph

Here was the worlds worst wound. On passing the New Menin Gate, by Siegfried Sassoon is a powerful poem about 'sacrifice' which uses imagery to serve the poem.The big idea of this poem is that who will remember the dead  people because people will just walk away and won't remember the names. "....endured that sullen swamp" and "struggled in the slime" are examples of imagery of sight which describes the condition and location which the soldiers had to cope with. "Here was the worlds worst wound" is an example of a metaphor and imagery which describes the sight refering the soldiers to a wound. It tells us that loads of soldiers have died and that you can only see blood, which shows the impact of war. Siegfried Sassoon uses all this figurative language to show how many people have given their lives for us and that half of them are not even seen because there are just too many deaths and injuries. Who will remember the all the dead people?!