Scally need advice

[Alvendor]

You can try to only defend on that part of the map, attacking close to his spawn point makes it very easy for him to defend.

If you know he will be rushing a mobi very early the counter is to only make 4hp soldiers and position them in attacking range. As soon as you see the mobi you attack and hope he wont have enough wits/units to defend. But then if he creates a decent defense before creating a mobi it gets harder...