Germans used the strategy known as blitzkrieg (As I recall it's german for lightning war), which was highly effective. Blitzkrieg is a highly mobile form of infantry and armour working together in combined arms teams and was heavily supported with close air support.
That battle was in WW1 in France. The battle consisted of an offensive by the British and French armies against the German Army, which, since invading France in August 1914, had occupied large areas of that country.
The German strategy was to control the Volga river and stop the flow of supplies into Russia thus eventually winning the war on the Eastern Front . The Germans lost the battle for the strategic city of Stalingrad February 2, 1943 losing the German's Sixth Army along with most of the Italian , Romanian and Hungarian troops supporting the battle . The Germans lost and never regained the initiative on the Eastern Front and the Russians came to lose Berlin and the war against the Russians .
The overall strategy during the Battle of Moscow in late 1941 was primarily defensive for the Soviet Union, aimed at halting the advancing German forces. The Soviets utilized a combination of strategic withdrawals, counteroffensives, and the harsh winter conditions to their advantage. They aimed to exhaust German supply lines and morale while mobilizing their reserves for a counterattack, which ultimately led to a successful defense of the city. This battle marked a significant turning point in World War II, as it halted the German advance into the Soviet Union.
The Eastern Front battle of August 1914 was known as the Battle of Tannenberg. It saw German forces decisively defeat the Russian army, marking a significant early victory for Germany in World War I. The battle showcased the effectiveness of German military strategy and led to heavy Russian casualties and the capture of many troops.
During World War II, the strategy for the German side in the Battle of the Bulge was developed almost entirely by Adolph Hitler, who conceived of this battle as the turning-point in the entire war. On the Allied side, Generals Eisenhower, Bradley, Montgomery, and Patton figured most prominently in the successful response to the German offensive.
To be the fastest to attack
In German, blitz means lightning and krieg means war. So the German concept of a blitzkrieg was to invade a certain country quickly, with overwhelming force, before a defense could be mounted.
The south used strategies like trying to cut off the railroad. Also the trench welfare.
I have no answer to this question.
In WWII it was the blitzkrieg.
See website: Battle of Midway
German mercenaries had a reputation for being particularly brutal in battle.