I’m surprised by all these calls of alliances being a dumb idea when even today it is an integral part of many nations defense.
The actual problem was not that there were intricate alliances but, that the alliances set up under Otto Von Bismarck which politically isolated France from Europe, was undone by the pig headed, and petty Kaiser Wilhelm II.
Wilhelm II also made sure that he steered Germany into conflicts over African colonial forays and muscled its way into a Naval arms race with Great Britain. As much as popular history tries to make it look like everyone was to blame it was Germany, hungry to establish itself as a major power, that accelerated what was a minor political incident between Austria and Serbia (Which was quickly resolved when war broke out) into a World war.
Oh and off the top of my head
Arch duke assassinated in Serbia.
Austria sends Ultimatum which is set up to embarrass and neuter Serbia
Serbia refuses and Austria Mobilizes
Russia, in support of Serbia begins mobilization
Germany Mobilizes and despite a few letters exchanges between cousins Wilhelm and Nicolas Germany does not back down.
France begins to Mobilize in support of Russia and to get back at Germany for loss of Alsace and Lorraine in 1871 Franco/Prussian war
Germany opts for Schlieffen plan swinging through Belgium and Netherlands into France and straight for the capital.
Britain drawn in due to treaty guaranteeing Belgium’s neutrality.
German Army halted in France in Miracle of the Marne where every available cab and auto transport enough French troops to stop German advances.
After a few vain cavalry attacks trying to outmaneuver and break through each sides lines both sides dig in and there is a race to the sea as they try feebly to outflank each other.
1914 ends with an unauthorized Christmas truce on the Western Front denoted by several gift exchanges and soccer games between combatants. It is quickly halted by the officers and neither side would do that again for the duration of the war.
The next four years saw major bloody battles at Ypres, Somme, and Paschendale in which heavy artillery bombardment followed by a rush of troops was designed to break through the deadlock. Tens of thousands are lost killed or injured in each battle which last weeks on end.
Germany tried to use mustard gas to dislodge the British lines and came close to breaking through during the panic, luckily the Canadian line held when one officer recalling some chemistry lessons ordered his men to urinate on their hankies and cover their faces. (The ammonia in the urine crystallized the chlorine making it inert) The holding action allows for other British regiments to fill the gaps and stop the German advance.
In the Air planes, a new technology go from simple reconnaissance to fighters to bombers as pilots on both sides invent the art of air combat , including squadrons and Dogfighting tactics. Many Aces rise to fame.
At sea the floating big guns get only a few chances to meet and after the Battle of Jutland the German Navy never ventures out again. Meanwhile the German U boats show the world a new type of Naval warfare.
Tanks are introduced in 1917 and accompanied with new tactics on the ground the war begins to become more mobile. The United States is drawn into the ware after the sinking of the Lusitania by a German Sub when Germany engages in unrestricted submarine warfare.
Russia which had not fared as well as the Western nations with many German victories by Generals such as Hindenburg, coupled with Russian civil unrest and poor supplies for the soldiers on the front. Russia erupts into revolution and the Czar is arrested. The new Russian government tries to resume the war but the Bolsheviks under the smuggled in Lenin and Trotsky stage another revolution over throw the new government and sue for peace with the Germans.
1918 had Germany try one last offensive with the new troops transfered from the East, but with Fresh soldiers from the US to bolster the Western ranks Germany’s advances petered out and exhausted eventually accepted an armistice with the Western alliance but due to its weakened condition (having just overthrown their own Kaiser and suffering a few Mutinies in the navy) Germany accepts terms which favour the other side.
Treaty of Versailles signed but Wilson’s 14 points not passed by US congress and weakened US influence leads to stronger terms against Germany.
Pause button hit. World war I restarts in 1939 with a new name to finally settle the matter of Germany’s place in Europe.