Let's face it guys...with few exceptions, our modern military could lay waste to most superheroes. Exceptions are the overpowered ones...don't get me started on those. : (
Here is the battle situation:
4 Fighter jets. 4 Attack Helicopters. 4 Tanks. 4 Nuke armed bombers (last resort)
Infantry: 30 Marines armed with automatic rifles, 10 of them have rocket launchers.
Batman (don't tell me Bat's gonna out prep this, his cannon fodder here, he gets 10 minutes prep, long enough to put on his insider suit if needed; no mega weapon allowed.)
Miss Marvel (i now she's tough, but if punches can take her down from hulk, then what I tell you, will a nuke or missile do? She is not Wonder Woman)
Iron Man (from the movie, I really think he's done for here too, he's never had to face this mess before)
Mr Freeze (he is here as an extra, he will no doubt be cannon fodder)
Poison Ivy (tough lady, but if Bats can put her down, what will the military do?)
Location: Sahara desert.
Fact: Military knows all about what the superheroes can do.
If you even say the heroes take this, you really need to explain how. If you think this is overkill, tell how to even it up. Even then, my point is..there is a reason why super villains rely on exotic weaponry rather than just guns all the time. Because guns and missiles are more lethal. And they would kill off the heroes too early to make any money comic books.