[Solved] Detect units inside another unit

[Wasabee]

I'm making the ability of orc burrow in a unit called turtle caravan where when mur'gul slaves rallies inside the turtle the attack of the turtle will be enabled. I don't know how the detect units inside the turtle. Can anyone help me?

 

[Zwiebelchen]

There's an event: Unit enters transport.

 

[Wasabee]

Oh thank you I missed that part.