For this purpose you should have some evidence to prove that you have lend him money . In a friendly manner you can bring to his notice that you are faced with a cash flow problem and that you shall very much appreciat if he could refund the money that you have loaned to him . If he is trying to avoid the repayment the only solution that you have is to send a letter demand through a Lawyer .
On the other hand if you have given him the money in good faith at least make a request for him to pay the money back in few instalments which is a further concession that you are giving him . If he is a real faithful friend he will honour his word. There is a common saying that when you lend money to a friend you loose the money as well as the friend .
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.