Of course, France was a major producer of grain in its own right. But French grain yields depended, as they did in Germany, on large quantities of nitrogen-based fertilizer, which could be supplied only at the expense of the production of explosives. And like German agriculture, the farms of Western Europe depended on huge herds of draught animals and on the daily labour of millions of farm workers. The removal of horses, manpower, fertilizer and animal feed that followed the outbreak of war set off a disastrous chain reaction in the delicate ecology of European peasant farming.
