Since the beginning of the Great War, each of the warring sides tried to starve the other. To reach this objective, they focused their efforts to destroy the enemy supplies. Great part of them was transported by merchant ships: that’s why the control over the seas became extremely important.
Even if the sneaky U-Boats caused great destruction, the naval blockades imposed by the Allied forces proved decisive. It has been estimated that in 1915, the German Empire lost almost half of the materials that used to received before.
The loss of fertilizers was particularly serious, causing in a few months a drastic decrease in agricultural production.
The plan organized by Hindenburg (*1) to optimize resources, had no other effect than prolonging the agony. Malnutrition shattered the morale of the troops, lacking the strength needed to fight. The number of victims among the civilians was huge.
*1: Paul von Hindenberg, German military officer, statesman, and politician.
