The V-3 &quot;England cannon&quot; was the third and last of Adolph Hitler&#x27;s &quot;vengeance&quot; weapons. V= vergeltungswaffe= retaliation weapon. Original designs called for a barrel length of 490 feet. My understanding is that the development model(s) were around 430 feet. It was designed to fire artillery ordinance over 200 miles upon targets in England. The Germans never were able to make this weapon operational. However the did develop and use in combat two smaller versions against targets in Belgium.