There are some images that attest the presence of the poet in the siege of the Sanctuary, some exhorting the troops and others at the command post of the republican troops.
This helps the poet to convey in detail the development of the siege, as he explains in On the taking of Cabeza. Letter and clarification.
“(…) I attended the combat from the first moments, although without pencil or paper, I do not like nor can I exploit the moment I live, and I prefer to relive it remembering it. (…)
South Front. Number 15, May 13, 1937