Longe worked as a bank clerk in Jamaica before spending the majority of his wartime service in West Africa, India and Vassieux-en-Vercors in the department of Drôme in southeastern France.

On the night of 28/29 June 1944, Longe and his team parachuted into a field in the French commune of Vassieux-en-Vercors in the department of Drôme in southeastern France.

The SOE leader in southeastern France, Francis Cammaerts, was furious that Longe and his team had been sent to Vercors without his knowledge and permission.

After a few days hiding out in the forests, Longe and Houseman with maquis guides began a trek on foot to Switzerland and safety, crossing the border on 11 August.

"[8][9] On 19 July 1945, Longe was awarded the Military Cross by King George VI for gallantry during active operations against the enemy.