 Complete the following phrase:  Whittaker enjoyed immediate success, winning the League title in 194748; led by captain Joe Mercers strong defence and with goals from attacking front two of Reg Lewis and Ronnie Rooke, Arsenal were top of the table from October until the seasons climax, winning by a seven-point margin. However, given the age of the Arsenal side at the time Rooke and Mercer were both over thirty, as were Denis and Leslie Compton, long-term success was not possible. In response, Whittaker had brought in younger players such as Doug Lishman, Alex Forbes and Cliff Holton. Although Arsenal were unable to sustain any challenges for the League title, with the new blood they won the FA Cup in 194950, with Reg Lewis scoring both goals in 