Lawrence served two years under Admiral Vernon in the West Indies campaign, and returned to Virginia in the autumn of 1742. He proved himself a hero in war. Irving says: "He was present at the siege of Carthagena, when it was bombarded by the fleet, and when the troops attempted to escalade the citadel. It was an ineffectual attack; the ships could not get near enough to throw their shells into the town, and the scaling ladders proved too short. That part of the attack, however, with which Lawrence was concerned, distinguished itself by its bravery. The troops sustained, unflinching, a destructive fire for several hours, and at length retired with honor, their small force having sustained a loss of about six hundred in killed and wounded."
Lawrence intended to return to England after a brief stay at home.
"My record will insure me a promotion in the army," he said to his father, who was averse at first to his return.
"Very true; but army life is objectionable in many ways," his father replied. "The honors hardly pay."
"But my experience for two years has fitted me for that service more than for any other, and that is to be thought of," suggested Lawrence.
"Yes; but other avenues to business are always open to young men of spirit," remarked his father. "Nor is it necessary for them to leave the country in order to accomplish a noble purpose."
However, Mr. Washington withdrew his objections to his son's return to the army; though, subsequently, he was pleased that he abandoned the project under the following circumstances.
There lived an educated English gentleman in Fairfax County by the name of William Fairfax. He had charge of a very large estate belonging to his cousin, Lord Fairfax, of England. This William Fairfax had a daughter, Anne, as well educated and accomplished as Lawrence. Mutual respect between Lawrence and Anne ripened into mutual love, and they became engaged. This unexpected episode in the lives of the promising couple changed the plans of Lawrence; and he voluntarily abandoned the idea of returning to the army.
The martial spirit of George did not abate when Lawrence came home from the war; it rather increased than otherwise. For his ears were regaled with many stories of army life, in which bravery, peril, bloodshed, and hairbreadth escapes were strangely mixed. There was a singular fascination in these tales of war to George; and he never tired of listening to them. The more he heard, the more he enjoyed playing soldier. He was constantly learning military tactics, too, from the lips of his brother. Being a bright, intelligent boy, he readily comprehended and appropriated information upon a subject that was so congenial to his heart. Lawrence was impressed by the precocity of his little brother, as well as his tact at soldiering, so that he was all the more gratified to nurture his martial spirit by rehearsing his experience in war. Lawrence was twenty-four years of age, and George but ten, so that the latter looked up to the former somewhat as a son looks up to a father, drinking in his words as words of wisdom, and accepting his experience as that of an officer of rank. Lawrence became his military teacher, really; and the opportunity to George proved a sort of West Point.
Lawrence, and others, too, were very much charmed by George's manly bearing, even before he was ten years old. John Fitzhugh said of him, "He was born a man."