Conversation so far:
What was John role in first world war?
In January 1915, Keynes took up an official government position at the Treasury.
How did he help the British?
Among his responsibilities were the design of terms of credit between Britain and its continental allies during the war and the acquisition of scarce currencies
Which people were there to help Keynes in designing terms of credit between Britain and its continental allies?
Bankers pushed for the suspension of specie payments – the convertibility of banknotes into gold – but with Keynes's help the Chancellor of the Exchequer was persuaded this was a bad idea
Which other names were mentioned in the First world war?
According to economist Robert Lekachman, Keynes's nerve and mastery became legendary because of his performance of these duties, like when he managed to assemble a small supply of Spanish pesetas.

Question: What was their role in the war?
Self-contained rewrite: What was the Spanish pesetas' role in the war?