Ok, to try to be clear, let us assume that you take a Space Cruiser, in which you may carry up to 20 units. You elect to take 2x Tactical formations, and 2x Devastator formations.
At the start of the game, you will plot the turn that the space Cruiser comes on, and you will plot where its bombardment will land. You will also plot the 4x zones where the Marine formations will land. (it is usually a good idea to keep them fairly close together to provide mutual support)
When the Space Cruiser activates you do the following:-
- Determine whether there are any troops under the Space Cruiser bombardment, and roll for each unit affected (enemy or friendly).
- Nominate a Marine infantry formation and determine where the drop pod actually lands. Carry out a deathwind attack against *all* enemy units within 15cm of the drop pod. Then deploy the infantry units in 5cm of each other and within 15cm of the drop pod.
- Declare the second formation, deploy the drop pod, carry out another set of deathwind attacks against *all* enemy units within 15cm of that drop pod and then deploy its infantry.
- Declare the third formation, deploy the Drop pod, carry out deathwind attacks within 15cm of that drop pod and then deploy its infantry.
- Declare the fourth and last formation, deploy the drop pod, carry out Deathwind attacks within 15cm of the drop pod and deploy the final set of infantry.
- Now the enemy checks each affected formation and withdraws any that are broken
Note that Deathwind attacks only affect enemy units; they do not attack Marine units in range. Also each Deathwind attack puts a BM on every enemy formation that is in range.