The Vietnamese word "giao binh" refers to a "class" or "encounter" between two armies. It can be understood as a military engagement or confrontation that occurs unexpectedly.
While "giao binh" primarily refers to military encounters, it can also metaphorically describe any kind of confrontation or significant meeting between opposing forces in broader contexts, such as sports or political debates.
In summary, "giao binh" is a term used to describe an unexpected military encounter between two armies. It is often used in discussions about history, strategy, and the dynamics of warfare.