I am probably just getting my lore mixed up, but my understanding is thus;
4th Corpo War happens because uh, uhhm
Silverhand wants to dick on Arasaka
Militech hire him and his friends (why would they do this? aren't Militech a big evil corp too?) to fuck on Arasaka
They go in with the nuke, Silverhand wants to find Alt
then, either
Silverhand gets his shit rocked deep in the Arasaka labs by Smasher
or
Silverhand nearly escapes with the gang, but Smasher gets him at the last second and he gets interrogated by the head of Arasaka
do we know which happened? or if neither, what did happen? was silverhand really as retarded and useless as they want us to think he is?