The phrase "marched up the cannon mouth" may seem tricky to spell, but with the help of IPA phonetic transcription, the spelling becomes clearer. The word "marched" is spelled /mɑːtʃt/ with a silent "e" at the end. "Up" is spelled /ʌp/, with the "u" pronounced like the "u" in "cup." "The" is spelled /ði/, with the "e" pronounced like the "e" in "weird." Finally, "cannon" is spelled /ˈkænən/ with a double "n" sound in the middle. Happy spelling!