Stuck: OldTown S2A8
 

i have to reach gate4 in fromt of me.
on the left top is a guy with a rocket launcher, on the right another guy shooting at me.
as soon as i leave my defence i get killed by rocket launcher and cant reach onother guy to posses.
i dont have a rocket launcher because there wasnt one before.
did a miss something?

tnx for any strategy/help

p.s.
hw to make screenshots?