In December 1970, when the prospects of the United Kingdom joining the European Union started to grow greater, Milne said "If more countries go into the Common Market, it will start the greatest war ever seen," later comparing the common market to the Roman Empire, stating that both would eventually become rich and subject to external pressures.
In December 1970, as the United Kingdom's entry into the European Union became increasingly likely, Milne expressed his fears about the potential for war if more countries joined the Common Market. He compared the common market to the Roman Empire, suggesting that both would eventually become wealthy and vulnerable to external forces.