From a Vietnamese Facebook 'friend'

One of my Vietnamese Facebook "friends" sent me this photo and poem.
I've highlighted the line in the poem which appears on the photo.

“Hometown of salt water, copper ore
My village is poor, rocky soil, plowed up
He's sometimes a stranger to me
We do not know each other.
Gun beside the gun, head close to the head
The cold night together in a double romance
Comrades!”