Major-General Sir Isaac Brock KB (6 October 1769 – 13 October 1812) was a British Army officer and administrator from Guernsey. Brock was assigned to Lower Canada in 1802. Despite facing desertions and near-mutinies, he commanded his regiment in Upper Canada (present-day Ontario) successfully for many years. He was promoted to major general, and became responsible for defending Upper Canada against the United States.