In "Heart of Darkness" what is the French man of war doing and why does Marlow refer to it as insanity?

The French steamer takes Marlow along the coast of Africa, stopping periodically to land soldiers and customshouse officers. Marlow finds his idleness vexing, and the trip seems vaguely nightmarish to him. At one point, they come across a French man-of-war shelling an apparently uninhabited forested stretch of coast. They finally arrive at the mouth of the Congo River, where Marlow boards another steamship bound for a point thirty miles upriver. The captain of the ship, a young Swede, recognizes Marlow as a seaman and invites him on the bridge. The Swede criticizes the colonial officials and tells Marlow about another Swede who recently hanged himself on his way into the interior.

Explanation: I am not sure but hope this help

idk= i don't know the answer

1.creeping like a snail is a simile used in this poem and it means the child is going to school unwillingly./a child is unwilling to go to school.

2. man becomes very frail and loses his physical strength when he becomes old, so much that his leggings that used to fit him snugly when he was in his youth are now too loose for him to wear, and that his shank has shrunk so much that this worldly stage is too big for a feeble actor like him. although, 'his youthful hose' just refers to his leggings/pants/ to shrink from danger; to shrink from contact.

3.the words "sans" means "without." it is a french word that is often used in english even today. so he is saying that in the last age of a man, the man is without eyes, taste, or anything else. he also says that this is the "last stage of all" and that it is the stage that ends a man's "history."

hope this !