We were lucky. We could have arrived to discover that the harbour was empty; there had been no way to knowing how many ships we would find until this moment, and we were satisfied. We chose four targets. We turned back towards the cargo ship and pulled up alongside. Her hull shrouded us in darkness. We could hear the crew singing. I wondered what they’d be singing in a few hours’ time. It proved an easy target. I attached my magnet-holder to the hull to prevent the tide from carrying us away.