The correct answer is "He was a leader in the British army."
George Washington (1732-1799) leaded the American forces in the American Revolutionary War and became the First President of the United States, this why he is considered one of the Fathers of this country.
The Seven Years' War took place before all that, between 1756 and 1763. It was a global conflict involving all European powers. Due to the his former experience in the French and Indian Wars, Washington was appointed leader of the British militia from Virginia, and fiercely fought the French there.