As Arthur had anticipated, after declaring war on the Polish government, Germany swiftly undertook a nationwide mobilization.
The total number of the German Army was only 600,000, which made winning the war a considerable challenge.
With strategic planning by the German Army Headquarters, Germany formulated a detailed mobilization policy, aiming to increase the size of its army to around 1.5 million.
Although the Poles received the news of the war several hours later, the Polish government was not to be outdone; they issued a national mobilization order on the same day, expecting to call up a staggering 2.25 million troops.
In comparison to the Spanish Civil War, where the total mobilized forces on both sides barely reached 1 million after more than a year of conflict, the military forces committed at the outset of the German-Polish War are projected to be close to 4 million.
Clearly, this was a war on a truly grand scale.