The poem explores the soldiers' emasculation and loss of identity due to the harsh conditions of war, which contrast with the expected masculine, powerful identity of soldiers
there are two places being criticized here one is obviously the war itself and these freezing conditions but remember it's a protest bone and so the place that's really being criticized is back home that's where we get this verse where he starts dreaming about being at the fireside back home because he wants the readers back home to realize the luxury that they have as a consequence of the terrible conditions of that the soldiers have and he wants them to start protesting against the war