As a commodore, he was in charge of commanding the entire fleet.

commodore 是名词，来自法语"commandeur"，指海军中低于海军上将但高于海军上校的军衔，中文通常译为"海军准将"或"舰队司令"。这个词也用于指商船队的高级船长或游艇俱乐部的负责人。