The tone of the passage is dejected and it is helped by the stark haunting imagery of the passage.
Explanation:
The passage carries a meaning of dejected failure on the part of the speaker who is talking of the ruin that has been brought on him and his pitiful condition is described.
The imagery is what helps the tone.
Words like ravenous, perched, feast help establish the tone.
The image of the fall of two mighty eagles who are then perched and then eating from the hands of dead soldiers as ravens and crows wait for their feast.
This creates a horror and instills pathetic emotions that makes one understand the pain of the speaker.
