What was the number of Personal Staff Units Killed?
CREATE TABLE table_56583 (
    "Unit" text,
    "Complement" text,
    "Killed" text,
    "Wounded" text,
    "Missing" text
)
SELECT "Killed" FROM table_56583 WHERE "Unit" = 'personal staff'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What was the number of Personal Staff Units Killed? ### Input: CREATE TABLE table_56583 (
    "Unit" text,
    "Complement" text,
    "Killed" text,
    "Wounded" text,
    "Missing" text
) ### Response: SELECT "Killed" FROM table_56583 WHERE "Unit" = 'personal staff'