Answer:
The detail from Heart of Darkness shows the ineffectiveness of the colonizers is that a warship fires at the land, even though there is nothing there to shoot.
Step-by-step explanation:
"Heart of Darkness" by Joseph Conrad is a novel that tells events about the constant misused of resources from the colonizers at the moment of taking power over Africa, some of them were not really made to gain something from the land but to demonstrate the great power they have and how they could do whatever they pleased to.