What's the difference between 战略 and 策略？ What's the difference between 战略 and 策略？

The word I am looking to translate from English is "strategy." I vaguely remember a Chinese teacher once explaining 战略 as more of high level strategy and 策略 as department-based tactics. 

I've found an article on the Chinese MBAlib explaining "pricing strategy" as 价格策略.   MBAlib Link
战略
  1.指导战争全局的计划和策略。对战术而言。 （战术: tactic）
  洪深《戏剧导演的初步知识》：“兵书上说得好：战略与战术乃二个全异之行动。战术是关于战斗诸种行动之指导法，战略乃连系配合各种战斗之谓。战略为作战之根源，即创意定计；战术乃实行战略所要求之手段。”
  2.有关战争全局的。
  由战略防御转入战略进攻。
  3.比喻在一定历史时期指导全局的方略。
  邓小平《高级干部要带头发扬党的优良传统》：“我们一定要认识到，认真选好接班人，这是一个战略问题。”  
  
  战略，是一种从全局考虑谋划实现全局目标的规划，战术只为实现战略的手段之一。实现战略胜利，往往有时候要牺牲部分利益，去获得战略胜利。战略是一种长远的规划，是远大的目标，往往规划战略、制定战略、用于实现战略的目标的时间是比较长的。
  争一时之长短，用战术就可以达到！如果是“争一世之雌雄”，就需要从全局出发去规划，这就是战略！


战略 and 策略 may not be directly mapping to English as strategy and tactic. But for sure, 战略 is something that think bigger, long term, comprehensive and high level one. From Chinese to English, the mapping English word for 战略 is strategy. But from English to Chinese, the word for strategy can be 战略 or 策略. It depends.
Why is 策略 here for Pricing Strategy? I think this is because 战略 is more comprehensive, globally, something bigger than only pricing. It may consider all the aspects the corporation should care about. Sometimes, 战略 could be more abstract than 策略. Pricing is just one aspect, specific and detail topic here. If you search 经营策略 in that site, you will find many words about 经营战略. Because 企业经营（running business） is more strategy and bigger topic than pricing. 

And another thing is that 战略 is now widely used in many competitive context, not only about military and war.