Discussion about Sylvan (Wood Elves).

I'm playing as Dyraell on the "Disputed Island" map (medium size) on hero level. There, phoenixes guard a narrow passage to the center of the map – it needs to be broken through, and the sooner, the better. On "hero" level, there are few resources, and there aren't many on the map itself. Question: playing as Dyraell, what's the best way to destroy the phoenixes at the beginning of week 3, or at least week 4?