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Britain developed the Q-ship – a merchant vessel with concealed guns.

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Germany had 33 U-boats, or submarines, in operation in 1914. The German navy saw an opportunity to starve Britain.

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There were just 20 of these airships in operation at any one time, but as they flew above the reach of British aircraft they bombed almost with impunity.

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The tank was specifically developed to break the trench warfare stalemate – their armour would be impervious to machine gun fire, and their tracks would be able to cross trenches and barbed wire entanglements.

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Wood-and-canvas aircraft, which they intended to use as aerial scouts, which allowed a machine gun mounted on a plane to fire without damaging the propeller.

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The British also deployed chlorine gas, and later developments in the war included the deadlier phosgene and mustard gas, which blinded those it came in contact with.

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The Germans began shelling the French capital with their long-range 'Paris Gun'. Made by Krupps, it had a 118-foot-long barrel and could fire a shell 25 miles into the air, targeting Paris from a site 74 miles away.

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Used to even deadlier effect across the expanses of no man's land that separated the two sides on the Western Front.

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Barbed wire became a deadly defensive weapon on the Western Front during the Great War. It snagged on equipment and clothing and slowed attackers, who were often prime targets for snipers as they desperately tried to disentangle themselves.

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Reliable rifle well-suited to the harsh conditions of trench warfare. A trained regular soldier could fire 15 rounds per minute with the weapon.