user: Question: What is the Battle with Bulgarian Commander Ivan Asen II?
Columns: ['Battle', 'Date', 'Bulgarian Commander', 'Latin Commander', 'Result']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Battle of Adrianople', '14 April 1205', 'Kaloyan', 'Baldwin I', 'Bulgarian victory']
SQL:

assistant: SELECT "Battle" FROM "Table" WHERE "Bulgarian Commander" = 'Ivan Asen II';