WARSAW

First off, I would not go out of my way to make this event happen artificially. Since this game requires several playthroughs, it will likely happen naturally. It will happen fore sure if going for the "Once More Unto the Breach" achievement. Alternatively if the Srodmiescie district is limping along towards the end of a Day 63 playthrough, simply ignore it towards the last few weeks and let it fall due to attrition.