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

### Instruction:
What is the Bulgarian Commander in Autumn 1040 at the Battle of Thessalonica?

### Inputs:
table_name: table, columns: ['Battle', 'Date', 'Bulgarian Commander', 'Byzantine Commander', 'Result']

### Response:
SELECT Bulgarian Commander FROM table WHERE Battle = battle of thessalonica AND Date = autumn 1040