I have a rendezvous with Death   
At some disputed barricade,   
When Spring comes back with rustling shade   
And apple-blossoms fill the air—   
I have a rendezvous with Death
When Spring brings back blue days and fair.   
   
It may be he shall take my hand   
And lead me into his dark land   
And close my eyes and quench my breath—   
It may be I shall pass him still.
I have a rendezvous with Death   
On some scarred slope of battered hill,   
When Spring comes round again this year   
And the first meadow-flowers appear.   
   
God knows ‘twere better to be deep
Pillowed in silk and scented down,   
Where love throbs out in blissful sleep,   
Pulse nigh to pulse, and breath to breath,   
Where hushed awakenings are dear...   
But I’ve a rendezvous with Death
At midnight in some flaming town,   
When Spring trips north again this year,   
And I to my pledged word am true,   
I shall not fail that rendezvous.

this thread sums up the op in a nutshell

what

The Destruction of Sennacherib

Especially this part:

For the Angel of Death spread his wings on the blast,
And breathed in the face of the foe as he passed;
And the eyes of the sleepers waxed deadly and chill,
And their hearts but once heaved, and for ever grew still!

No longer mourn for me when I am dead
Than you shall hear the surly sullen bell
Give warning to the world that I am fled
From this vile world with vildest worms to dwell:
Nay, if you read this line, remember not
The hand that writ it, for I love you so
That I in your sweet thoughts would be forgot,
If thinking on me then should make you woe.
O if, I say, you look upon this verse
When I perhaps compounded am with clay,
Do not so much as my poor name rehearse,
But let your love even with my life decay,
  Lest the wise world should look into your moan
  And mock you with me after I am gone.