Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the Badge/Serial Number of the Policeman who died in Gunfire on 1919-02-18?

### Inputs:
table_name: table, columns: ['Rank', 'Badge/Serial Number', 'Tenure', 'Date of death', 'Cause of death']

### Response:
SELECT Badge/Serial Number FROM table WHERE Rank = policeman AND Cause of death = gunfire AND Date of death = 1919-02-18