Instigated by a relatively routine control stop that quickly escalated into an international incident following the construction of the Berlin Wall and increased tension among the occupying forces, culminating with the partition of the city and the Soviets seeking a separate peace with East Germany. Resulting with the standoff between Russian and American tanks eventually withdrawn in stalemate five days later, the crisis was sparked on this evening in 1961 when US Deputy Chief of Mission in West Berlin, Edward Allan Lightner, Jr and his wife were asked to present their identifications at Checkpoint Charlie en route to attend an opera in East Berlin. Refusing to comply (Khrushchev had relented on earlier demands of restricted movement of the Allies) and thought their USAREUR plated vehicle was sufficient proof for passage. In response to this dispute, US president JFK recalled Lucius Clay from retirement as a show of American resolve, dispatching several armoured vehicles to the crossing along with a retinue of troops and a military police escort for the Lightners. A plan by the Americans to bulldoze the inchoate wall was countermanded, but there was a face-off nonetheless, which in addition to the tanks included US soldiers armed with Davy Crockett guns, an over the shoulder personnel launcher for tactical nuclear warheads. Under terms negotiated by spy, diplomat and back-channel contact Georgi Bolshakov, both sides stood down. Bolshakov later helped dispel thoughts that Khrushchev and the USSR conspired in the assassination of Kennedy for the public, his brother RFK and widow.