Final answer:
Louis-Joseph de Montcalm had a large and well-trained military that won several victories early in the French and Indian War; the other individuals listed did not match this description.
Step-by-step explanation:
The individual who had a large and well-trained military that won several victories early in the French and Indian War was Louis-Joseph de Montcalm. None of the options provided in the question, such as George Washington, Robert Dinwiddie, or Edward Braddock, match this description.
General Edward Braddock suffered a defeat while George Washington was only a young officer during the time. Montcalm, a French military leader, led his forces to several successes early in the war.