The three posters were to be pasted in public places all over Britain. They started to appear on the very day that the news broke that the country was at war.
But only the first two ever went up.
The first was fighting talk with a stark message. 'Freedom is in peril,' it warned, 'Defend it with all your might.'
The implication was very real. If the Nazi forces took Britain, then democracy would be over. The people would be enslaved and our culture would be eroded, along with our lives.
It didn't take much imagination to picture it. Stories of atrocities committed in the rest of Occupied Europe were in our newspapers. The full enormity of the horrors within the concentration camps was yet to be widely known, but there was enough information to make educated guesses.
Even if the average Briton wasn't up on current events abroad, then it was hard to ignore the Blitz. If anyone needed a hint of life under Hitler's rule, then the destruction of British cities said it all.
'Freedom is in peril' was designed to trigger every fear and channel it into bitter fighting. This wasn't necessarily just on the front line, but in the home, workplace and community. Get angry. Defend Britain in any way that presents itself to you was the moral of that poster.
The second was more consolatory. It seemed to acknowledge that people were afraid, distressed and ready to give up. It explained why all of these things were not helping. 'Your courage, Your cheerfulness, Your Resolution, will bring us victory,' it maintained.
The emphasis on 'your' was important. It made it personal and hit straight at that sense of helplessness. There was something that ordinary people could do. By simply staying positive, they were going to ensure that this was one day over.
It's those which the people alive then remember now. 400,000 copies of the 'Freedom' and 800,000 copies of the 'Courage' posters were plastered over everything from buses to bill-boards. In their very ubiquity, these slogans were hard to miss.
The British people never saw the famous 'Keep Calm' slogan on a poster, but with very, very good reason. The circumstance in which it would have been put up never happened.