Table schema:
CREATE TABLE table_name_58 (badge_serial_number VARCHAR, date_of_death VARCHAR, rank VARCHAR, cause_of_death VARCHAR)

Question: What is the Badge/Serial Number of the Policeman who died in Gunfire on 1919-02-18?
SQL: SELECT badge_serial_number FROM table_name_58 WHERE rank = "policeman" AND cause_of_death = "gunfire" AND date_of_death = "1919-02-18"