Synonyms for the phrase "marched to cannon mouth" suggests a military-like appearance or a show of force. Alternatives for this phrase include "strode towards the artillery," "advanced to the mouth of the gun," "approached the cannon's barrel," or "marched towards the artillery's maw." These phrases depict a sense of strength, confidence, and sometimes, danger. It showcases the readiness of soldiers to face a battle or engage in war. As a result, the phrase could also allude to a metaphorical situation where one is about to confront a challenge or an obstacle with fortitude and bravado.