Here are the correct statements matched with their corresponding terms:
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Poisonous Gas
- The use of this forced the development of special masks.
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Machine Guns
- These were operated by two people. One feeding in ammunition and the other aiming and firing.
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Tanks
- These were used to roll over the barbed wire and fend off enemy gunfire.
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Trench Warfare
- The soldier would dig mazes cut directly into the ground.
The statement regarding "red colored uniforms" and "horses and mules" doesn't directly match with the given terms. The appropriate pairings based on historical context have been made above.