During the preparations for the attack, Marshal Zhukov personally visited the front and noticing the poor organisation, insisted on a one-week delay in the start date of the planned attack. The operation was code-named "Uranus" and launched in conjunction with Operation Mars, which was directed at Army Group Center. The plan was similar to the one Zhukov had used to achieve victory at Khalkhin Gol three years before, where he had sprung a double envelopment and destroyed the 23rd Division of the Japanese army.