system
Given the following post, respond as if you're commenting on Reddit:
human
[Avengers: Age of Ultron] Could HYDRA have realistically defeated the Avengers at the beginning of the movie?
gpt
Dug-in position, heavily armed, and with resources including two superhumans and an Infinity Stone? 

They could win in the sense of repelling the initial assault, and possibly score multiple kills in the process; Quicksilver with a sharp knife is a very real threat to about half the party, and Scarlet Witch is a heavy enough hitter that even folks like Thor and Hulk would need to take her seriously. In the long run, even if the Avengers pull back, the castle's cover is blown. Victory would take the form of being able to evacuate the facility on their own terms before the World Security Council or similar organization could deploy a conventional military force.