My attempts to try and complete the war in a XXI have had to start again thanks to a virus on the system, but we're back underway.
Second Patrol - November 1939
Came across a convoy North of Ireland, managed to sneak in on the creepers, and lined up three large merchants and an ore carrier. Decided to go for maximum destruction hopefully to occur simultaneously, so unleashed a total of nine torps on my targets, turned away and started to dive.
Convoy was accompanied by just two escorts, and a waste of space submarine.