Ostensibly, the Proto-Daleks were intended to further the war effort of their respective nations. In reality, the New Dalek Paradigm arranged their creation to complete the final stage of the Dalek Project. The British Proto-Daleks were manufactured in the factories of Lord Hellcombe, who presented one of them to some visitors as the latest weapon to win the war. The Eleventh Doctor was worried about what purpose the robot had. This Dalek recognised him as the enemy of the Daleks and tried to kill him and Edward Anderson. However, they succeeded in eluding the Proto-Dalek by escaping up a flight of stairs.
Eventually, when the time came for the final stage of the Dalek Project, both Proto-Dalek factories became automated, mass-producing legions of the mechanical Daleks. The robots were then ordered by the true Daleks to converge on a battle between British and German troops, and turn on the humans they were ostensibly created to serve in order to eradicate all evidence of Dalek intervention. Hellcombe sacrificed himself to destroy the German Proto-Dalek factory, while the Doctor reprogrammed the British Proto-Daleks so that they recognised true Daleks as the enemies. This aided the combined armies to destroy the true Daleks. All Proto-Daleks were destroyed by artillery barrage along with the Daleks. (COMIC: The Dalek Project)
Proto-Daleks were manufactured during the Great War, and thus looked like a real Dalek casing had it been designed using early 1900sera technology. The British variants, like their German counterparts, used miniature tank treads for mobility, the eyestalks were much bulkier and camera-like, and were armed with a contemporary machine guns in place of the typical gunstick. The casing were was painted in dull, military colours, predominantly khaki for the British. They also sported manipulator arms similar to those used by true Daleks, but they were mounted on a pivot rather than a balljoint.
The British Proto-Daleks were distinguished from their German counterparts in that they had only three sense globes on each panel of the base unit — with two bulky midsection rings replacing the upper set of spheres. The eyestalk was thick and cylindrical, while the dome's luminosity dischargers were shaped like smaller glass hemispheres, and the mesh neck supporting the done itself had two thin metal bands wrapped around it. In addition, they sported Union Flag on their back mid section.
Despite the sharp physical differences, both Proto-Dalek variants possessed identical attributes: they were impervious to bullets. Despite being claimed to withstand mortars, grenades and light artillery, a German soldier destroyed a German Proto-Dalek with a hand grenade and heavy artilleries and shell bombardment destroyed several Proto-Daleks. They were also not immune to real Dalek weaponry.