“Churchill” (*** out of four) was a compelling biographical drama of the famed British Prime Minister (Brian Cox) set during the 96 hours leading up to the D-Day invasion and how his opposition to the war led to him going against the main general (John Slattery) and others in England. Cox’ first-rate performance dominates and takes center stage in this film, even as the story covers limited ground and you wish it had a wider focus on other areas of his life. Ella Purnell and Miranda Richardson also stand out in key supporting roles.