Lance Corporal Blake is a fictional character from the film 1917, directed by Sam Mendes. Set during World War I, he is portrayed by actor Dean-Charles Chapman. Blake is tasked with delivering a critical message to save a battalion from walking into a trap. In the film, Blake's character is driven by a personal motivation, as his brother is among the soldiers in danger. His bravery and determination highlight the themes of sacrifice and camaraderie in wartime. The story unfolds in real-time, emphasizing the urgency of his mission and the challenges he faces along the way.