The Pat O'Leary Line (also known as the Pat Line, the O'Leary Line, and the PAO Line) was a resistance organization in France during the Second World War. The Pat O'Leary escape line helped Allied soldiers and airmen stranded or shot down over occupied Europe evade capture by Nazi Germany and return to Great Britain. Downed airmen in northern France and other countries were fed, clothed, given false identity papers, hidden in attics, cellars, and people's homes, and escorted to Marseille, where the line was based. From there, a network of people escorted them to neutral Spain. From Spain, British diplomats sent the escapees home from British-controlled Gibraltar. Many different escape lines were created in Europe of which the Pat Line was the oldest and one of the most important. Collectively, the many escape lines helped 7,000 Allied military personnel, mostly airmen, escape occupied France, Belgium, and the Netherlands. The Pat Line received financial assistance from MI9, a British intelligence agency.
"Pat O'Leary" was the pseudonym of Albert Guérisse, one of the early leaders of the line, which helped more than 600 Allied soldiers and airmen escape from France to Spain. More than 100 volunteers or "helpers" as they were often called, mostly French, working for the Pat Line were arrested and imprisoned by Vichy French or German authorities. Most were imprisoned for the remainder of the war but many were executed or died in concentration camps.[1]