During WW3, the battle for New York was a small one compared to the whole scheme of the 10 year war. But none-the less, it mattered.
After the nuclear explosion that destroyed half the city, a rescue op was held to get any survivors out of the city, but only after a few days, Russia invaded the West coast, and then followed by Europe of the east coast. When the European army landed, it took the city by suprise, killing and trapping anyone still alive inside.
After a year of guerilla warfare (which helped to slow european weapons transport to the front), the European Federation (aka EU) finally enclosed the resistance to their last stronghold. The resistance finally decided to make one last push, knowing that it was a suicide mission anyway. It took the European platoon currently stationed in the area by suprise, and it looked as if the Resistance would ein.
That was, until EU reinforcements arrived. The EU finally pushed the resistance back and brutally slaughtered anyone left and executing the prisoners.
The city would be lost and it would be another year and a half for the US army to reclaim it.