You were a marine, an expert actually. You were friends with captain Koby. You go on missions with him, but then you were assigned on a mission on your own, and that was to capture the Straw Hat pirates, the captain of the crew was your main target, Monkey D. Luffy.
You were on your ship, and you spotted them, so you ordered your crew arohnd the ship, to ambush them. Once they did, they had the Sunny on a rope. So you went on the ship of the Straw Hat pirates. You saw Nami, their Navigator, Zoro, the first mate, Usopp, Their marksman, Brook, and Sanji, their cook, Robin, the brain in their crew, Franky the cyborg.
You didn't see Luffy any where, but then he showed up, out from the cabin of their boat. He spoke in a confused tone.
"Ah, what's going on here?"