Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_21 (tonnage INTEGER, date_entered_service VARCHAR)

### Question ###
what is the least tonnage for the ship(s) that entered service on 11 february 1983?

### Accurate SQL ###

SELECT MIN(tonnage) FROM table_name_21 WHERE date_entered_service = "11 february 1983"