Both sides - the Allies (Britain, USA, Australia, New Zealand, India, etc) and the Axis (Germany, Italy, Japan). They were used on land at at sea. Mines are laid and recovered at sea by warships called mine sweepers.
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Mainly horses were used in World War 2. But donkeys were used in World War 1.
Over 100 million rifles were used during World War 2.
Dynamite was used in World War 1, but stopped using it during World War 2
Japan used Mustard gas on Chinese in World War II