The invasion of Poland by German forces (quickly joined by their then-allies the Soviets) ignited the Second World War. Despite determined resistance, Poland was quickly conquered but Poles continued the struggle to the very last day of the war against Germany, resisting the occupier within their homeland and fighting in exile with the Allied forces.

Evan McGilvray, drawing on intensive research in Polish sources, gives a comprehensive account of Poland's war. He reveals the complexities of Poland's relationship with the Allies (forced to accept their Soviet enemies as allies after 1941, then betrayed to Soviet occupation in the post-war settlement), as well as the divisions between Polish factions that led to civil war even before the defeat of Germany.

The author narrates all the fighting involving Polish forces, including such famous actions as the Battle of Britain, Tobruk, Normandy, Arnhem and the Warsaw Rising, but also lesser known aspects such as Kopinski's Carpathian Brigade in Italy, Polish troops under Soviet command and the capture of Wilhelmshaven on the last day of the war.