How to finish Desperate Drive - Alliance Campaign

[simcode]

In Desperate Drive - Alliance Campaign I've reached Sumgan and the yellow arrow. I don't see any other arrows. Nothing happens.

How do I "Break through to Sumgan".

I must missing something. I've killed off all the infernal forces. What else is there left to do?

Thanks.

[crayno]

Derrick needs to be on the arrow spot, that will finish the mission