The rockets travelled at supersonic speed, impacted without audible warning, and proved unstoppable, as no effective defence existed. Teams from the Allied forces—the United States, the United Kingdom, and the Soviet Union—raced to seize key German manufacturing facilities, procure Germany's missile technology, and capture the V-2's launching sites. Von Braun and over 100 key personnel surrendered to the Americans, and many of the original team ended up working at the Redstone Arsenal. The US also captured enough hardware to build approximately 80 of the missiles. The Soviets gained possession of the manufacturing facilities after the war, re-established production, and moved it to the Soviet Union.