In his study, the English historian-publicist John Kimhi exposes the generally accepted thesis that in the fall of 1939, Britain and France were not able to give an armed rebuff to fascist aggression. Kimhi scrupulously analyzes documentary materials and convincingly proves the reluctance of the British and French ruling circles to fulfill their obligations towards countries threatened by Nazi Germany. Having studied the relevant documents about the Anglo-French “guarantees” to Poland, the author clearly demonstrated how the governments of these countries behaved when it came to fulfilling the promises they made. The historian emphasizes that it was the double-dealing of the West in relation to Poland that allowed Hitler to derive maximum benefit from his policy of appeasement. The book contains sensational facts confirmed by authentic documents.