Britain used its economic power to expand the Royal Navy, doubling the number of frigates and increasing the number of large ships of the line by 50%, while increasing the roster of sailors from 15,000 to 133,000 in eight years after the war began in 1793. The British national output remained strong, and the well-organized business sector channelled products into what the military needed. France, meanwhile, saw its navy shrink by more than half. The system of smuggling finished products into the continent undermined French efforts to ruin the British economy by cutting off markets.