The Battle of Brooklyn, also called the Battle of Long Island, was fought on August 27, 1776, less than two months after independence was declared. New York's harbor and waterways offered the British an ideal base from which to isolate New England and control the Hudson. General William Howe brought a large, experienced army to Staten Island, while George Washington divided his less-seasoned force between Manhattan and defensive works on western Long Island.

British and Hessian troops landed at Gravesend Bay and advanced toward a line of wooded heights crossed by several passes. American commanders guarded some routes but left the Jamaica Pass inadequately protected. Guided through it during the night, a major British column turned the American left and appeared behind troops already engaged from the front. The maneuver transformed a difficult defense into a near encirclement and exposed the Continental army's weaknesses in reconnaissance and command.

Fighting spread through the hills, roads, and fields of present-day Brooklyn. Some units resisted fiercely, including Maryland troops whose repeated counterattacks near the Gowanus helped others escape. Thousands of Americans were killed, wounded, or captured, and survivors withdrew into fortifications on Brooklyn Heights. Howe halted rather than immediately storming the works, perhaps avoiding unnecessary casualties while siege preparations and the Royal Navy threatened Washington's position.

On the night of August 29–30, Washington organized a silent evacuation across the East River to Manhattan. Sailors, notably men from John Glover's Massachusetts regiment, ferried troops, horses, cannon, and supplies through darkness, adverse currents, and fog. The operation rescued the remaining force before British troops discovered the withdrawal. The battle was a serious defeat, but the escape preserved the Continental Army as an institution capable of continuing the war.

The modern city covers much of the battlefield, so markers, parks, cemeteries, street patterns, and surviving elevations help reconstruct the action. Numbers reported on individual markers often simplify estimates that vary by source and by whether they count troops present, engaged, or held in reserve. What is certain is the scale of the British advantage and the effectiveness of the flanking march. The campaign forced Americans to confront the risks of defending New York.

Brooklyn shaped Washington's later caution and demonstrated that survival could matter more than possession of a city. The British gained New York and held it for the rest of the war, using it as headquarters, prison center, and military base. Yet they failed to destroy the rebellion's main army. The marker commemorates both sacrifice and strategic recovery: an inexperienced force suffered a crushing reverse, escaped, and learned how to wage a longer war against superior conventional power.