Secret War in Portugal [1939-1945]
For SOE [British Special Operation Executive] 24 Land was the code name for Portugal

Portuguese neutrality

Portuguese statement of neutrality was issued 2nd September 1939. Salazar knew, from our Ambassador at Vichy, about Hitler's intentions towards Spain and had compromises Francisco Franco with two treaties that prevent Spain to accept Hitler's invitation to join forces without previous consultations with Portuguese Government.
Our non alligment was a major key to the future events of war. Here the official statement written by Salazar with his handwritten remarks.
About this topic, read here [Costa Leite, 1998], and here [JAB, 2011]