user: Question: How many where killed under Major-General Jean Victor de Constant Rebecque's command?
Columns: ['Unit', 'Commander', 'Complement', 'Killed', 'Wounded', 'Missing']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Quarter-master-general', 'Major-General Jean Victor de Constant Rebecque', '20 off 126 men', '1 off 0 men', '8 off 0 men', '0 off 0 men']
SQL:

assistant: SELECT SUM("Killed") FROM "Table" WHERE "Commander" = 'Major-General Jean Victor de Constant Rebecque';