Flint uncovers, and destroys, a secret Nazi base in Canada which has been interfering with RAF training missions.; Following orders, Spider has to act as a foot soldier during an attack on a fort led by Philip. Unfolding events lead Spider to realise Philip is a coward.; Tommy and Harry convince the authorities they aren't deserters, and get directed back to their regiment. They can't make it back during the day so rest up in a destroyed farmhouse during the night. They are awoken by the sound of approaching tanks.