The Sun Has Set in Flanders by E. Marquina
I’m currently reading Captain Alatriste by Arturo Perez-Reverte, and this is the frontispiece. I’m not sure if it’s the entire poem as I couldn’t find it online.
The Sun Has Set in Flanders
By E. Marquina
Was once a captain,
the story goes,
who led men into battle,
though in death’s throes.
Oh, señores! What an apt man
was that brave captain!
