This means the narrator regret coming ashore that night because of the event he witnessed.
"All of a sudden, bang! bang! bang! goes three or four guns—the men had slipped around through the woods and come in from behind without their horses! The boys jumped for the river—both of them hurt—and as they swum down the current the men run along the bank shooting at them and singing out, “Kill them, kill them!” It made me so sick I most fell out of the tree. I ain’t a-going to tell ALL that happened—it would make me sick again if I was to do that. I wished I hadn’t ever come ashore that night to see such things. I ain’t ever going to get shut of them—lots of times I dream about them.
Obviously, it can be seen that some men after some boys and they were shooting at them. The boy even though hurt, jumped into the river but that still didn't stop the men from going after them. It was a really terrifying experience to the narrator.
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