By 12 September, all of Poland west of the Vistula had been conquered except for the isolated Warsaw. The Polish government, led by President Ignacy Mościcki, and the high command, led by Marshal Edward Rydz-Śmigły, left Warsaw in the first days of the campaign and headed southeast, reaching Lublin on 6 September. From there, it moved on 9 September to Kremenez and, on 13 September to Zaleshiki, on the Romanian border. Rydz-Śmigły ordered the Polish forces to retreat in the same direction, behind the Vistula and San Rivers, beginning the preparations for the defence of the Romanian Bridgehead area.