Question: On what date did the he Maryland 400 repeatedly charge a numerically superior British force?

Context articles: Battle of Lissa (1866)
Operation Koronis
Battle of Korsuń
Stanley T. Adams
Battle of Mons
Battle of Delaware Bay
Marquis de Bussy-Castelnau
Maryland 400
Battle of Long Island
Battle of Isandlwana

The Battle of Lissa (sometimes called "Battle of Vis") took place on 20 July 1866 in the Adriatic Sea near the Dalmatian island of Lissa ("Vis" in Croatian) and was a decisive victory for an outnumbered Austrian Empire force over a numerically superior Italian force.
 It was the first major sea battle between ironclads and one of the last to involve deliberate ramming.
Operation Koronis (Greek: Επιχείρηση «Κορωνίς» , "crown" in Greek) was a military campaign launched by royalist government in Athens against the main stronghold of the communist forces during the Greek Civil War.
 The communist defenses were two lines of fortifications with minefields and concealed bunkers.
 Initial air attacks used small-sized bombs and inaccurate targeting, but eventually the frequency of attacks was more than tripled.
 After neutralizing the minefields by forcing herds of animals to walk over them, the government army launched simultaneous attacks from two sides.
 In the southwest, the hill of Kleftis changed hands repeatedly.
 With heavier casualties against a numerically superior opponent, the communists had their wounded and artillery moved across the border to the People's Republic of Albania, while the remaining 8,000 retreated to Mount Vitsi.
Battle of Korsuń (Ukrainian: Корсунь , Polish: "Korsuń" ), (May 26, 1648) was the second significant battle of the Khmelnytsky Uprising.
 Near the site of the present-day city of Korsun-Shevchenkivskyi in central Ukraine, a numerically superior force of Cossacks and Crimean Tatars under the command of Hetman Bohdan Khmelnytsky and Tugay Bey attacked and defeated Polish-Lithuanian Commonwealth forces under the command of Hetmans Mikołaj Potocki and Marcin Kalinowski.
 As in the previous battle at Zhovti Vody, the outmanned Commonwealth forces took a defensive position, retreated, and were thoroughly routed by the opposing force.
Stanley "Stan" Taylor Adams (May 9, 1922 – April 19, 1999) was a United States Army officer who received the U.S. military's highest decoration, the Medal of Honor, for his actions in the Korean War.
 A native of Kansas, Adams fought in World War II as an enlisted soldier.
 He was sent to Korea as a sergeant soon after the outbreak of war there, and was awarded the Medal of Honor for leading a bayonet charge against a numerically superior force in early 1951.
 Commissioned as an officer shortly after receiving the medal, Adams continued to serve into the Vietnam War, eventually retiring as a lieutenant colonel.
The Battle of Mons was the first major action of the British Expeditionary Force (BEF) in the First World War.
 It was a subsidiary action of the Battle of the Frontiers, in which the Allies clashed with Germany on the French borders.
 At Mons, the British Army attempted to hold the line of the Mons–Condé Canal against the advancing German 1st Army.
 Although the British fought well and inflicted disproportionate casualties on the numerically superior Germans, they were eventually forced to retreat due both to the greater strength of the Germans and the sudden retreat of the French Fifth Army, which exposed the British right flank.
 Though initially planned as a simple tactical withdrawal and executed in good order, the British retreat from Mons lasted for two weeks and took the BEF to the outskirts of Paris before it counter-attacked in concert with the French, at the Battle of the Marne.
The Battle of Delaware Bay, or the Battle of Cape May, was a naval engagement fought between the Kingdom of Great Britain and United States during the American Revolutionary War.
 A British squadron of three vessels attacked three American privateers, that were escorting a fleet of merchantmen.
 The ensuing combat in Delaware Bay, near Cape May, ended with an American victory over a superior British force.
Charles Joseph Patissier, Marquis de Bussy-Castelnau (1718 – 7 January 1785) or Charles Joseph Patissier de Bussy was the Governor General of the French colony of Pondicherry from 1783 to 1785.
 He served with distinction under Joseph François Dupleix in the East Indies, receiving the Order of Saint Louis.
 He contributed to the recovery from Britain of Pondicherry in 1748, and was named in 1782 to lead all French military forces beyond the Cape of Good Hope.
 He coordinated his operations with Pierre André de Suffren and fought with distinction against the numerically superior British during the Indian campaigns of the American War of Independence.
The Maryland 400 were members of the 1st Maryland Regiment who repeatedly charged a numerically superior British force during the Battle of Long Island during the Revolutionary War, sustaining heavy casualties, but allowing General Washington to successfully evacuate the bulk of his troops to Manhattan.
 This action is commemorated in Maryland's nickname, the "Old Line State."
 A monument in Brooklyn and multiple plaques were put up in the memory of this regiment and the fallen soldiers.
The Battle of Long Island is also known as the Battle of Brooklyn and the Battle of Brooklyn Heights.
 It was fought on August 27, 1776 and was the first major battle of the American Revolutionary War to take place after the United States declared its independence on July 4, 1776.
 It was a victory for the British Army and the beginning of a successful campaign that gave them control of the strategically important city of New York.
 In terms of troop deployment and fighting, it was the largest battle of the entire war.
The Battle of Isandlwana (alternative spelling: Isandhlwana) on 22 January 1879 was the first major encounter in the Anglo–Zulu War between the British Empire and the Zulu Kingdom.
 Eleven days after the British commenced their invasion of Zululand in South Africa, a Zulu force of some 20,000 warriors attacked a portion of the British main column consisting of about 1,800 British, colonial and native troops and perhaps 400 civilians.
 The Zulus were equipped mainly with the traditional assegai iron spears and cow-hide shields, but also had a number of muskets and old rifles though they were not formally trained in their use.
 The British and colonial troops were armed with the state-of-the-art Martini-Henry breech-loading rifle and two 7-pounder (3-inch, 76 mm) mountain guns deployed as field guns, as well as a Hale rocket battery.
 Despite a vast disadvantage in weapons technology, the numerically superior Zulus ultimately overwhelmed the poorly led and badly deployed British, killing over 1,300 troops, including all those out on the forward firing line.
 The Zulu army suffered around a thousand killed.