Final answer:
George Washington's defeat in 1754 during the early stages of the French and Indian War was due to insufficient resources and support, as well as the superior military tactics of the French and their Native American allies.
Step-by-step explanation:
George Washington and his army were defeated when he led an army against the French in 1754 due to a combination of factors which included insufficient resources and support, as well as superior French military tactics. The hastily constructed Fort Necessity fell to the French and their native allies after Washington's attack on the French. The British military efforts in the first years of what would be known as the Seven Years' War, or the French and Indian War in North America, suffered due to a series of defeats. One strategic failure for the British was General Edward Braddock's defeat at Fort Duquesne, where British and colonial forces were ambushed, leading to a disastrous retreat and the death of General Braddock himself. These early struggles were reflective of the broader challenges faced by the British, including inexperienced militias, supply shortages, and powerful alliances formed by the French with various Native American tribes.