World war i quickly escalated into the first total war, which nations

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Conscription into the military for all countries involved.

Women working in munitions factories, heavy industry, and many other jobs they hadn't done before.In Britain, women were conscripted into such work.

A War Economy adopted in Britain, France,and Germany, whereby manufacture of weapons, munitions, and other war materiel was prioritized.

German naval bombardment of coastal British towns, and air raids over London. When the war ended, Britain was constructing a heavy bomber force that they were planning to use to attack German cities.

German u-boats attacked and sank civilian merchant shipping and liners.

The British naval blockade, which had the intention of (and successfully accomplished) starving Germany into surrender. 760,000 German civilians died during WW1 (compared to 500,000 in WW2), almost all from starvation due to the naval blockade.

The Germans used long range super guns to bombard Paris in 1918.