Difference between 兵法 vs 武術
兵法 Art of War


用兵作戰的策略和方法。
strategies and methods of warfare.
兵書。
military books, which discuss the strategies and methods of warfare.


武術 Martial Arts


軍事技術。
military technology.
中國民族體育之一 (one of the Chinese traditional sports.)。
如：太極拳 (tài-ji-quán, shadow-boxing)、劍術 (fencing)、刀術 (broadsword play)、槍術 (spear play, joust)、棍術 (stick/cudgel play)。 


兵法 is usually related to the country.
武術 is more personal.



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I found the following information on the Web.

《影響世界的中國元素--中國功夫》



《中华青少年成长必读集萃——万事由来》



《揭秘万物由来之谜》