Among my favourites are Home Lads Home, by Cicely Fox Smith, set to music by Sarah Morgan:

HOME LADS HOME

Overseas in Flanders the sun was setting low,
With tramp of feet and jingle as I heard the gunteams go.
But something seemed to set me a dreaming as I lay
Of my old Hampshire village at the quiet end of day.

CHORUS: And it's home, lads home, all among the corn and clover;
Home lads home, when the working day is over.
Where there's rest for horse and man; when the longest day is done,
And we'll all go home together at the setting of the sun.

Proud thatch with gardens blooming with lily and with rose;
The Meon flowing past them, so quiet as it goes.
White fields of oats and barley and the elderflower like foam,
And the sky a gold at sunset and the horses going home.

Captain, Boxer, Traveller, I see them all so plain,
With tasselled earflaps nodding all along the leafy lane.
Somewhere a bird is calling and the swallow flying low,
And the lads all sitting sideways and singing as they go.

Gone is many a lad now and many a horse gone too;
All those lads and horses from great fields that I knew.
For Dick fell at Givenchy and Prince beside the gun
On that red road to glory a mile or two from Mons.

Grey lads and shadowy horses, I see them all so plain;
I see them and I know them and I call them each by name
While riding down from Swanmore with all the West a-glow,
And the lads all sitting sideways and singing as they go;

CHORUS: And it's home, lads, home, with the sunset on their faces;
Home lads, home to those quiet happy places,
Where there's rest for horse and man, when the longest day is done,
And we'll all go home together at the setting of the sun.

Les Sullivan, a songwriter who deserves greater fame, has written two superb songs:

MENIN GATE

I see you reading names carved in stone
Each one a man with a tale of his own
You came to Ieper with your friends for fun
I came with mine but I carried a gun

I was a sailor barely nineteen
I fell so far from the sea
They play their bugles each night at eight
For people like me at the old Menin Gate

We joined the navy to fight on the sea
Parfitt and Sawdy, young Dave Tee and me
Funny to think then the one ship we saw
Took us to Belgium to die in the war.

I was a sailor barely nineteen
I fell so far from the sea
They play their bugles each night at eight
For people like me at the old Menin Gate

Everywhere water, rain, mud and clay
One great explosion in water I lay
There in that shell hole that's where I drowned
And to this day well I've never been found

I was a sailor barely nineteen
I fell so far from the sea
They play their bugles each night at eight
For people like me at the old Menin Gate

Laugh with your friends as you travel this land
Read our four names perhaps you'll understand
Out in the fields there's an old shattered tree
And Parfitt and Sawdy, young Dave Tee and me.

I was a sailor barely nineteen
I fell so far from the sea
They play their bugles each night at eight
For people like me at the old Menin Gate.

and

JUTLAND

Where are you goin' my Billy-O,
Where are you goin' my Billy-O,
I'm joining a ship in Scapa Flow,
That's where I'm going my Nancy.

I'm joining "Queen Mary" Nancy-O,
Joining "Queen Mary" Nancy-O,
She's bristling with guns and ready to go,
To sail to glory with Jellicoe,

CHORUS: But where is "Queen Mary"? Gone Now!
And where is the glory? Gone Now!
And six thousand sailors, Gone Now!
They have gone to the bottom at Jutland.

Where are you goin' my Rodney-O,
IWhere are you goin' my Rodney-O,
'm joining a ship in Scapa Flow,
That's where I'm going my Nancy.

I'm joining "Invincible" Nancy-O,
Joining "Invincible" Nancy-O,
She's bristling with guns and ready to go,
To sail to glory with Jellicoe,

CHORUS: But where is "Invincible"? Gone Now!
And where is the glory? Gone Now!
And six thousand sailors, Gone Now!
They have gone to the bottom at Jutland.

Where are you goin' my Johnny-O,
Where are you goin' my Johnny-O,
I'm joining a ship in Scapa Flow,
That's where I'm going my Nancy.

I'm joining the "Black Prince" Nancy-O,
Joining the "Black Prince" Nancy-O,
She's bristling with guns and ready to go,
To sail to glory with Jellicoe,

CHORUS: But where is the "Black Prince"? Gone Now!
And where is the glory? Gone Now!
And six thousand sailors, Gone Now!
They have gone to the bottom at Jutland.

Bob Hambleton of Herga and Maidenhead Folk Clubs has also written a lovely song about song and war - sadly I haven't got the words. Micca has also written an affecting song about Thiepval.