Maczek served in World War I, as an officer of the Austrian Army who fought on the Italian front in 1914. Following the outbreak of World War I, Polish units were organized around the cities of Krakow and Lwow, and young Maczek volunteered his services to the reborn units of the Polish Army. He later served with distinction during World War II.
When the Nazis invaded Poland in 1939, Colonel Maczek commanded the 10th Motorized Cavalry Brigade, which had fought several battles before. On orders from Commander-in-Chief Marshal Rydz Smigly, the Brigade fighting the encircling Nazi forces crossed the Hungarian border where it was interned.
When Nazis invaded France in 1940, Gen. Maczek was given charge of the 10th Armored Cavalry Brigade, which fought bloody battles against the invader on June 16 and 17, and scored important victories in the vicinity of Montbard, and on the Burgundy Canal.
In February 1942, Gen. Maczek formed the First Polish Armored Division which proved its worth during the 1944 invasion of Europe. During the Battle of Normandy, Polish troops took part in the encircling move against Nazi troops, and were credited with the closing of the Caen-Fallaise Gap, where fourteen Nazi divisions were trapped and destroyed.
After this decisive battle, Gen. Maczek's Division continued to spearhead the Allied drive across the battlefields of France, Belgium, Netherlands, and finally Germany.
The Division's "moment of glory" came when its forces captured the German port of Wilhelmshaven and accepted the surrender of the entire garrison, which included some 200 vessels of Hitler's navy.
Gen. Maczek commanded the First Armored until the end of the hostilities in Europe, and was named Lieutenant General that same year. He died in 1994 at the age of 102.