The deployment was down the length of the table, as shown here.
The Eldar army is deployed around the two building at the top of the picture (Warpspiders and Swooping Hawks in reserve). My mistake was then to send my army straight down the middle towards the gap between the buildings.
That area around the shrine became a killing ground, especially when the Warpspiders and Swooping hawks were added to the mix. Got tabled and deservedly so.