How to get to yaka island? i cannot complete the scenario because i dont see how to get my army in his islands? i tried repairing outpost but it didnt repaired the bridge so im stuck..

Gosh, this was a while ago... I think, if i remember correctly, you have to go around the back of Yakas stronghold to get in. The northern side of it... it's been a while since I played that level though!

You can also use fliers or cast fire halo on all the units you want to move over the lava. If your armies have fire immunity they can walk on it.