Ну может не в начале, но на 58 есть:
Non-standard turn order
In a game with more than two turns per game
cycle, additional rules are necessary.
- The normal rules for engaged models, Initiative
order and splitting attacks between units apply.
- Models must attack in the Assault phase of their
unit and can choose their target unit freely.
- Models can only attack in an opponent’s Assault
phase if they are engaged with a unit that acts in
that turn. The models must direct their attacks
towards these units.
- If a model is only engaged with units that do not
act in this turn, the model may not attack.