General Overview:Parting the red sea is an opening strategy implemented first during deployment and is continued through your first few turns. This strategy has one main purpose, to give a melee oriented army a way to safely deliver its caster and battle group to the enemy. Following this strategy will allow you to jam your enemy, cover your flanks, and give your battle group a certain level of protection. This strategy will also give you the most options possible in terms of order of activation. Trolls are known to pull off some amazing combo's, however it can be hard to achieve those combo's if your order of activation is thrown off.
Here is a picture to give you a visual of what your trying to achieve

The water is the enemy, your tarpit unit are the forces that hold the water at bay, moses and the
pilgrims are your battle group. However, in this instance your not running away, your carving your
way to the enemies core.