Strange battles abound in the annals of military history, but almost none defies tactical logic like the capture of the Dutch fleet at Den Helder. In January 1795, during the French Revolutionary Wars, the only documented episode occurred in which a land cavalry force attacked, surrounded, and surrendered an entire naval fleet.
That winter was one of the harshest of the 18th century in Europe. Extreme temperatures froze large coastal areas of the Netherlands, including the Zuiderzee gulf. Fourteen warships of the Dutch navy, equipped with around 850 cannons and hundreds of crew members, became trapped in thick ice sheets near the island of Texel, completely immobilized and listing.
Upon learning of their vulnerability, French General Jean-Charles Pichegru ordered an unheard-of maneuver. On the freezing night of January 23, Colonel Louis Joseph Lahure led the 8th Hussar Regiment across the frozen sea. To prevent noise from revealing their approach in the winter stillness, the soldiers wrapped their horses' hooves with rags and thick cloths.
At dawn, the Dutch sailors woke up stunned: hundreds of horsemen armed with sabers and carbines surrounded their ships. With the vessels tilted by the ice, the naval artillery could not aim downward to repel the cavalry without cracking the ice and risking their own hulls. With no room to maneuver or chance to escape, the captains surrendered without a single drop of blood being shed.
Source: Service Historique de la Défense (France) and Rijksmuseum in Amsterdam