=Lizard=
Auto-translated
So, with 1 stack and slow-moving flyers/hasted units? I should try it...
2) - I didn't notice, it didn't fit on my 900x600 screen.
No haste is needed. You place a wall and press defend; they don't fly over it. You place a second wall, and they fly over it. Then you place the first wall again, and so on. It's not without reason that the fire wall's effect lasts exactly 2 rounds.