The Revolutionary War had begun. Lexington and Bunker Hill were as beacon-fires to the new nation. In 1776, the New York Convention ordered a company of artillery to be raised, and Hamilton applied for the command of it. Only nineteen, and very boyish in looks, his fitness for the position was doubted, till his excellent examination proved his knowledge, and he was appointed captain. He used the last money sent him by his relatives in the West Indies, to equip his company. College days were now over, and the busy life of the soldier had commenced. For most young men, the stirring events of the times would have filled every moment and every thought. Not so the man born to have a controlling and permanent influence in the republic. He found time to study about money circulation, rates of exchange, commerce, taxes, increase of population, and the like, because he knew that a great work must be done by somebody after the war. How true it is that if we fit ourselves for a great work, the work will find us. Meantime, Captain Hamilton drilled his troops so well that General Greene observed it, made the acquaintance of the captain, invited him to his headquarters, and spoke of him to Washington. Had not the work been well done, it would not have commanded attention, but this attention was an important stepping-stone to fame and honor. Hamilton was ever after a most loyal friend to General Greene. The company was soon called into active service. At the disastrous battle of Long Island, Hamilton was in the thickest of the fight, and brought up the rear, losing his baggage and a field-piece. After the retreat up the Hudson, at Harlem Heights, Washington observed the skill used in the construction of some earthworks, and, finding that the engineer was the young man introduced to him by General Greene, invited him to his tent. This was the beginning of a life-long and most devoted friendship between the great commander and the boyish captain. Later, at the battles of Trenton and Princeton, Hamilton was fearless and heroic. "Well do I recollect the day," said a friend, "when Hamilton's company marched into Princeton. It was a model of discipline; at their head was a boy, and I wondered at his youth; but what was my surprise when, struck with his slight figure, he was pointed out to me as that Hamilton of whom we had already heard so much.... A mere stripling, small, slender, almost delicate in frame, marching beside a piece of artillery, with a cocked hat pulled down over his eyes, apparently lost in thought, with his hand resting on a cannon, and every now and then patting it, as if it were a favorite horse or a pet plaything."