During his five years as an assistant director, Kurosawa worked under numerous directors, but by far the most important figure in his development was Yamamoto. Of his 24 films as A.D., he worked on 17 under Yamamoto, many of them comedies featuring the popular actor Ken'ichi Enomoto, known as "Enoken". Yamamoto nurtured Kurosawa's talent, promoting him directly from third assistant director to chief assistant director after a year. Kurosawa's responsibilities increased, and he worked at tasks ranging from stage construction and film development to location scouting, script polishing, rehearsals, lighting, dubbing, editing, and second-unit directing. In the last of Kurosawa's films as an assistant director for Yamamoto, "Horse" ("Uma", 1941), Kurosawa took over most of the production, as his mentor was occupied with the shooting of another film.