Where did Emanuel Leutze get his idea to paint Washington crossing the Delaware?

Emanuel Leutze was inspired to paint "Washington Crossing the Delaware" after learning about the significance of George Washington's daring 1776 surprise attack during the American Revolutionary War. Living in Germany and influenced by the ideals of democracy and freedom, Leutze sought to depict this pivotal moment as an emblem of American resilience and determination. He aimed to celebrate not just a military victory but also the broader struggle for liberty, making the painting a powerful symbol of American identity.