Information:  - Major-General Sir Isaac Brock KB (6 October 1769  13 October 1812) was a British Army officer and colonial 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. While many in Canada and Britain believed war could be averted, Brock began to ready the army and militia for what was to come. When the War of 1812 broke out, the populace was prepared, and quick victories at Fort Mackinac and Detroit defeated American invasion efforts.  - Lieutenant Colonel John Macdonell of Greenfield ( 19 April 1785 -- 14 October 1812 ) was an aide - de - camp to British Major General Sir Isaac Brock during the War of 1812 , dying in the Battle of Queenston Heights .  - The Battle of Queenston Heights was the first major battle in the War of 1812 and resulted in a British victory. It took place on 13 October 1812, near Queenston, Upper Canada (the present-day province of Ontario). It was fought between United States regulars and New York militia forces led by Major General Stephen Van Rensselaer, and British regulars, York and Lincoln militia and Mohawk warriors led by Major General Isaac Brock, and Major General Roger Hale Sheaffe, who took command when Brock was killed.  - General Sir Roger Hale Sheaffe, 1st Baronet (15 July 1763  17 July 1851) was a Loyalist General in the British Army during the War of 1812. he was created a Baronet in 1813 and afterwards served as Commander and acting Lieutenant Governor of Upper Canada. There is conflicting information to statements regarding his military accomplishments (1812) in the "Letters of Veritas" in and around page 50.    After reading the paragraphs above, we are interested in knowing the entity with which 'john macdonell' exhibits the relationship of 'military branch'. Find the answer from the choices below.  Choices: - british army  - regiment
british army