Clausewitz disagreed on two counts. First, he believed that friction was as inherent to war as it is to mechanical engineering and could therefore never be eliminated but only mitigated. Secondly, he believed that studying march tables and the like was not a fruitful means of mitigation. In fact, he came to think that friction had to be worked with. It actually provided opportunities, and could be used by a general just as much as it could be used by an engineer.