system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Could the Avengers have stopped the Chitauri invasion without the nuke?

It looked like they were loosing the battle before the nuke destroyed the mothership and shut all the Chitauri down. Would the Avengers have been able to save the day without the nuke?
gpt
If Mr. Stark was unable to catch the nuke and redirect it, the invasion would have still failed. The Avengers had control of the portal and were about to close it, so further reinforcements would be unable to get through. A few minutes later, the nuke would have detonated, turning the earthbound Chitauri and most of Manhattan into ashes, and leaving one seriously pissed off Bruce Banner on the loose.

I guess you could call it saving the day, because most of the Earth would be saved, but the death toll would be enormous.