On August 27, 1776, the Vechte-Cortelyou House (known today as Old Stone House), located in JJ Byrne park in the Park Slope neighborhood of Brooklyn, New York, was an important location in the Battle of Brooklyn during the American Revolutionary War - the first major engagement of the Continental Army after the Declaration of Independence, and the largest battle of the entire war.
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On that day at 9:00 am, George Washington arrived from Manhattan. having been informed that the British were close to a breakthrough of American lines. Washington realized that he had been completely fooled by a deceptive feint by the British on Long Island and he ordered more troops to Brooklyn from Manhattan. On the American right, to the west, Colonial General Stirling still held the line against Grant. Stirling held on for four hours, still unaware of the British flanking maneuver to his east, and some of his own troops thought they were winning the day because the British had been unable to take their position. This was intentional by the British. At 11:00 am, however, British General Grant, reinforced by 2,000 Royal marines, hit Stirling's center and Stirling was attacked on his left by the Hessians.
Stirling pulled back but British troops were, at this point, coming at him in his rear south down the Gowanus Road. The only escape route left was across a Brouwer' Millpond on the Gowanus Creek which was 80 yards wide, on the other side of which was Brooklyn Heights.
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Stirling ordered all of his troops, except a contingent of Maryland troops under the command of Major Mordecai Gist, to cross the creek. This group of Maryland troops became known to history as the Maryland 400, although they numbered about 260–270 men. Stirling and Gist led the troops in a rear-guard action against the overwhelming numbers of British troops which surpassed 2,000 troops supported by two cannon.
Stirling and Gist led the Marylanders in two attacks against the British, who were in fixed positions in and in front of the Vechte-Cortelyou House (known today as Old Stone House). After the last assault the remaining troops retreated across the Gowanus Creek. Some of the men who tried to cross the marsh were bogged down in the mud under musket fire and others who could not swim were captured. Stirling was surrounded and, unwilling to surrender to the British, broke through the British lines to von Heister's Hessians and surrendered to them. 256 Maryland troops were killed in the assaults in front of the Old Stone House and fewer than a dozen made it back to the American lines.
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General George Washington, viewing the particularly fierce fighting at the Vechte-Cortelyou House (known today as Old Stone House) from his vantage point atop a hill near the west end of present-day Atlantic Avenue, was famously reported to have emotionally exclaimed watching from a redoubt on nearby Cobble Hill (intersection of today's Court Street and Atlantic Avenue), was to have said, "Good God, what brave fellows I must this day lose!".
After its capture, the house was used as an artillery position by an estimated 2,000 British and hired Hessian soldiers who fired on the Americans, who had already suffered disastrous losses and were fleeing from the east to the American forts across the Gowanus Creek to the west. Some four hundred soldiers of the Maryland Brigade under Colonel William Smallwood regained the house twice that day, but were finally repulsed by the British, with very heavy casualties.
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The 256 dead troops of the Maryland 400 were buried by the British in a mass grave on a hillock on farmer Adrian Van Brunt's land on the outskirts of the marsh. It was from this battle that Maryland gained its nickname "The Old Line State." This mass grave is believed to be around the southwest corner of what is today 3rd Ave. between 7th and 8th Streets in Brooklyn.