Assess the human, logistic and financial resources that can be brought to bear on behalf of the campaign. Re-check these once you have set your early objectives. Do the resources and the objectives match up?

As soon as you know what your critical campaign action (or set of actions) is going to be, you should begin estimating your resource requirements. Make one of the objectives for the foundation or build up phase for the campaign to be that the critical phase will be fully resourced and to have those resources fully identified and available prior to entering the critical phase. Make sure that prior to entering the critical phase you have carried out a thorough resource estimation for both critical and end game campaign phases.