This is the 902nd most frequent Italian word.
caduto
"Caduto" means "fallen" in English.
Here, 'caduto' is the past participle of the verb 'cadere', used to indicate an action directly experienced by the subject.
Mio fratello è caduto mentre correva.
My brother fell while he was running.
'Caduto' describes the state of the tree after the action of falling, acting as an adjective modifying 'albero'.
L'albero caduto blocca la strada.
The fallen tree is blocking the road.
In this phrase, 'caduto' metaphorically represents those who perished, often in battle or defense of a cause.