What are 3 images of oppression in the first 5 stanzas of "elsewhere" by derek walcott?

somewhere a white horse gallops with its mane
plunging round a field whose sticks
are ringed with barbed wire, and men
break stones or bind straw into ricks.

somewhere women tire of the shawled sea's
weeping, for the fishermen's dories
still go out. it is blue as peace.
somewhere they're tired of torture stories.

that somewhere there was an arrest.
somewhere there was a small harvest
of bodies in the truck. p soldiers rest
somewhere by a road, or smoke in a forest.

somewhere there is the conference rage
at an outrage. p somewhere a page
is torn out, and somehow the foliage
no longer looks like leaves but camouflage.

somewhere there is a comrade,
a writer lying with his eyes wide open
on mattress ticking, who will not read
this, or write. how to make a pen?