The opposition "country party" attacked Walpole relentlessly, primarily targeting patronage, which they denounced as immoral corruption. In turn Walpole imposed censorship on the London theatre and subsidised writers such as William Arnall and others who rejected the charge of evil political corruption by arguing that corruption is the universal human condition. Furthermore, they argued, political divisiveness was also universal and inevitable because of selfish passions that were integral to human nature. Arnall argued that government must be strong enough to control conflict, and in that regard Walpole was quite successful. This style of "court" political rhetoric continued through the 18th century. Field Marshal Lord Cobham, a leading soldier, used his own connections to build up an opposition after 1733. Young William Pitt and George Grenville joined Cobham's faction—they were called "Cobham's Cubs". They became leading enemies of Walpole and both later became prime minister.