Come, all ye jolly tinner boys

"Come, all ye jolly tinner boys" is a traditional folk song associated with Cornwall that was written about 1807, when Napoleon Bonaparte made threats that would affect trade in Cornwall at the time of the invasion of Poland. The song contains the line Why forty thousand Cornish boys shall knawa the reason why.

Source: Wikipedia — Come, all ye jolly tinner boys (CC BY-SA 4.0)