Recent Tournament - Gypsy's Retreat - how did you do it?

When playing Gypsy’s Retreat in the recent tournament, I couldn’t do better than getting wiped out as slowly as possible. Playing it on hard in Single Player or in the tournament, even if I went straight for the spiders and used them to slow down the Blight’s larger units… I always ended up watching my ineffective Goblin archers, mostly out of mana, facing off against 50 to 100 spider strong stacks.

However several of you managed to win this… what strategy did I miss?