Admiral Nelson's most frequent cry was for more frigates. Though not ships of the line these fast and powerful warships were the 'eyes of the fleet'. They enabled admirals to find where the enemy lay and his likely intentions, as well as patrolling vital trade routes and providing information from far-flung colonies. Together with their smaller cousins, the sloops and brigs of the Royal Navy, they performed a vital function.Generally commanded by ambitious young men, these were the ships that could capture enemy prizes and earn their officers and men enough prize-money to set them up for...