"Going to war" is a phrase often used in reference to armed conflict between nations, groups, or individuals. However, there are many synonyms that can be used to describe this act of aggression. Some common alternate phrases include "declaring war," "launching a military campaign," "waging war," "commencing hostilities," or simply "attacking." Other more specific phrases may include "invading," "mounting an offensive," "engaging in combat," or "taking up arms." It is important to note that while these phrases may be used interchangeably, they all carry varying connotations and implications for the severity and purpose of the conflict.