It was based on a successful play, "The New Henrietta", which had already been filmed once, under the title "The Lamb", with Douglas Fairbanks playing the lead. Fairbanks recommended Keaton to take the role for the remake five years later, since the film was to have a comic slant. After Keaton's successful work with Arbuckle, Schenck gave him his own production unit, Buster Keaton Productions. He made a series of two-reel comedies, including "One Week" (1920), "The Playhouse" (1921), "Cops" (1922), and "The Electric House" (1922). Keaton then moved to full-length features. Keaton's writers included Clyde Bruckman, Joseph Mitchell, and Jean Havez, but the most ingenious gags were generally conceived by Keaton himself. Comedy director Leo McCarey, recalling the freewheeling days of making slapstick comedies, said, "All of us tried to steal each other's gagmen. But we had no luck with Keaton, because he thought up his best gags himself and we couldn't steal "him!"" The more adventurous ideas called for dangerous stunts, performed by Keaton at great physical risk. During the railroad water-tank scene in "Sherlock Jr.", Keaton broke his neck when a torrent of water fell on him from a water tower, but he did not realize it until years afterward. A scene from "Steamboat Bill, Jr." required Keaton to stand still on a particular spot. Then, the facade of a two-story building toppled forward on top of Keaton. Keaton's character emerged unscathed, due to a single open window. The stunt required precision, because the prop house weighed two tons, and the window only offered a few inches of clearance around Keaton's body. The sequence furnished one of the most memorable images of his career. Aside from "Steamboat Bill, Jr." (1928), Keaton's most enduring feature-length films include "Our Hospitality" (1923), "The Navigator" (1924), "Sherlock Jr." (1924), "Seven Chances" (1925), "The Cameraman" (1928), and "The General" (1926). "The General", set during the American Civil War, combined physical comedy with Keaton's love of trains, including an epic locomotive chase. Employing picturesque locations, the film's storyline reenacted an actual wartime incident.