Can't finish "Long Way Home" bonus mission

[rackhir]

I managed to rescue all four hero's and grab the artifacts from the forge. However, when I move them all to the gate (which has a yellow quest arrow pointing at it) nothing happens.

I have tried many things: putting hero's on the gate one at a time, moving them all down the road past the gate, even sitting still on the far side of the gate and just clicking through turns.

I am at a loss for how to trigger the ending here. I got my first hero to the gate in time for a hard/gold victory, but at this point I will settle for any clue to finish, even if I have to settle for bronze.

edit: this question is in reference to the bonus mission unlocked by finishing the second Khrand map on gold in Elven Legacy: Magic