A cabin boy

I'm behind a crate well not a small one as I'm 14 years old but I'm watching the captain instruct the musketeers across the deck to the other boat! My farther is wincing as the opponents blade scars his tanned skin for life. I get out and as I creep on to the other boat a cabin boy, like me, is sleeping, I go into the treasure chamber beneath a slime barrel on the upper deck ,is a chest  the slime dripped through the gappy soaked wood onto the chests lid. I steal the chest and return home.