Performance
Despite un-reinforced concrete's poor performance as armour against heavy weapons, they would have been quite adequate to defend against the lightly armed German paratroops who were the anticipated enemy at airfields.
These were emphatically not "armoured cars", but merely a pillbox that could be moved from place to place. It was claimed to travel "at normal lorry speed" but in practice it was primarily allocated to the flatness of airfields. Most had difficulty moving at all owing to their excess weight, poor visibility and reduced radiator cooling. Some broke down completely and were either towed, or abandoned in place. Those built on steam wagon chassis coped well with the extra weight once boilers were removed, but were no longer powered.
Read more about this topic: Bison Concrete Armoured Lorry
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“O world, world! thus is the poor agent despised. O traitors and bawds, how earnestly are you set a-work, and how ill requited! Why should our endeavour be so loved, and the performance so loathed?”
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