While Nazi Germany never attacked Britain with ground forces, it subjected the country to heavy air attacks in the Battle of Britain of 1940, which continued until mid-1941 as the nightly attacks of the Blitz. The air attacks killed 40,000 people and prompted evacuations of major urban centres, but achieved none of Germany's strategic objectives. The economy of Britain was re-oriented to military production. Efforts like the Women's Land Army boosted food production, while a rationing program regulated consumption. The United Kingdom passed a conscription law immediately after declaring war, but conscription was never implemented in Northern Ireland, despite urgings from the Stormont government, due to Irish nationalist opposition.