I think that part is the beginning of 為書, not the poem. It's 二〇三高地, so those two cups would be related to the Russo‐Japanese War. (The two poems would be different ones.)
Do you think it is this poem which relates to the Russo Japanese War?
O My Brother, You Must Not Die
by Akiko Yosano
O my young brother, I cry for you
Don't you understand you must not die!
You who were born the last of all
Command a special store of parents' love
Would parents place a blade in children's hands
Teaching them to murder other men
Teaching them to kill and then to die?
Have you so learned and grown to twenty-four?
O my brother, you must not die!
Could it be the Emperor His Grace
Exposeth not to jeopardy of war
But urgeth men to spilling human blood
And dying in the way of wild beasts,
Calling such death the path to glory?
If His Grace possesseth noble heart
What must be the thoughts that linger there?