Disaster under Gorlice changed the picture of war. It was true that from the west the Wermacht was approaching Warsaw, but without support from the south, he entered into the depths of Poland with a wedge which could easily slam behind his back, turning into a boiler.
Stalin canceled the order of attack. In this situation he could not pretend he had to step in, because Poland is gone - and the war did not want to. For now...
