user: Question: What was the tonnage of the Great Britain ship Batna?
Columns: ['Date', 'Ship', 'Nationality', 'Tonnage', 'Fate']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['2 December 1940', 'Stirlingshire', 'Great Britain', 6022.0, 'Sunk']
SQL:

assistant: SELECT "Tonnage" FROM "Table" WHERE "Nationality" = 'Great Britain' AND "Ship" = 'Batna';