Cross, south-east London. British intelligence sent false reports via their Double-Cross System implying that the rockets were over-shooting their London target by . This tactic worked; more than half of the V-2s aimed at London landed outside the London Civil Defence Region. Most landed on less-heavily populated areas in Kent due to erroneous recalibration. For the remainder of the war, British intelligence maintained the ruse by repeatedly sending bogus reports implying that the rockets were now striking the British capital with heavy loss of life. Possible use during Operation Bodenplatte At least one V-2 missile on a mobile Meillerwagen launch trailer was observed being elevated to launch position by a USAAF 4th Fighter Group pilot defending against the massive New Year's Day 1945 Operation Bodenplatte strike by the Luftwaffe over the northern German attack route near the town of Lochem on 1 January 1945. Possibly, from the potential sighting of the American fighter by the missile's launch crew, the rocket was quickly lowered from a near launch-ready 85° elevation to 30°. Tactical use on German target After the US Army captured the Ludendorff Bridge during the Battle of Remagen on 7 March 1945, the Germans were desperate to destroy it. On 17 March 1945, they fired eleven V-2 missiles at the bridge, their first use against a tactical target and the only time they were fired on a German target during the war. They could not employ the more accurate device because it was oriented towards Antwerp and could not be easily adjusted for another target. Fired from near Hellendoorn, the Netherlands, one of the missiles landed as far away as Cologne, to the north, while one missed the bridge by only . They also struck the town of Remagen, destroying a number of buildings and killing at least six American soldiers. Final use The final two rockets exploded on 27 March 1945. One of these was the last V-2 to kill a British civilian and the final civilian casualty of the war on British soil: Ivy Millichamp, aged 34, killed in her home in Kynaston Road, Orpington in Kent. A scientific reconstruction performed in 2010 demonstrated that the V-2 creates a crater wide and deep, ejecting approximately 3,000 tons of material into the air. Countermeasures Big Ben and Operation Crossbow Unlike the V-1, the V-2's speed and trajectory made it practically invulnerable to anti-aircraft guns and fighters, as it