 On 6 August 1996, three days before Yeltsin was to be inaugurated for his second term as Russian president and when most of the Russian Army troops were moved south due to what was planned as their final offensive against remaining mountainous separatist strongholds, the Chechens launched another surprise attack on Grozny.Despite Russian troops in and around Grozny numbering approximately 12,000, more than 1,500 Chechen guerrillas (whose numbers soon swelled) overran the key districts within hours in an operation prepared and led by Maskhadov (who named it Operation Zero) and Basayev (who called it Operation Jihad).The separatists then laid siege to the Russian posts and bases and the government compound in the city centre, while a number of Chechens deemed to be Russian collaborators were rounded up, detained and, in some cases, executed.