What is the origin of the idiom "stick to one's guns" and when to use it?

The origin of the idiom "stick to one's guns" can be traced back to the military and naval contexts. In the early 19th century, "stick to" was used as a colloquial expression meaning "to adhere to" or "to remain steadfast." The addition of "guns" in the phrase refers to firearms, specifically the cannons or artillery pieces used in warfare. Soldiers and sailors were expected to hold their positions and continue firing their guns, even in the face of intense opposition or adversity. It is often used in discussions or debates involving personal convictions, professional choices, or matters of principle.