After Henry's death, the Duke of Newcastle was prime minister six years in two separate periods. While his first premiership was not particularly notable, Newcastle precipitated the Seven Years' War, and his weak diplomacy cost him the premiership. After his second term, he served briefly in Lord Rockingham's ministry, before he retired from government. He was most effective as a deputy to a leader of greater ability, such as Walpole, his brother, or Pitt. Few politicians in British history matched his skills and industry in using patronage to maintain power over long stretches of time. His genius appeared as the chief party manager for the Whigs from 1715 to 1761. He used his energy and his money to select candidates, distribute patronage and win elections. He was especially influential in the counties of Sussex, Nottinghamshire, Yorkshire and Lincolnshire. His greatest triumph came in the 1754 election.