I would cross the field on the most downwind end and I would say to go VERY early in the morning. I mean hours before first light. In the pitch dark, deer have the tendency to skirt you but not leave. they know that you can't see as good as they. Once you are gone and not a threat they will relax and forget somewhat if you allow enough time between entering and when they leave the field. Once you are beyond the field, skirt THEM and setup behind where you think they will be feeding. They probably wont exit the field where they think you went. Just my take....