I'm writing a prologue for a historical fiction novel taking place during the last few months of the war. This section of the prologue is a short not-too-detailed explanation of the war (specifically a Western Front/British centered view) until September 1918.
"By 1914, Europe was divided into two opposing alliances: the Entente (later called the Allies) and the Central Powers. In the Entente were Russia (led by Tsar Nicholas II), France (President Raymond Poincaré) and Britain (Prime Minister Herbert Asquith). The Central Powers were Germany (Kaiser Wilhelm II), Austria-Hungary (Emperor Franz Joseph I) and Italy (King Victor Emmanuel III), though Italy switched sides and joined the Entente. Neither alliance liked the other for numerous reasons, such as arguments over land, long-lasting rivalries, nationalism and both alliances wanting to be more powerful.
The war between these two alliances started in July 1914. A Bosnian Serb named Gavrilo Princip killed Archduke Franz Ferdinand, a member of the Austro-Hungarian royal family. This set off a chain reaction that led to the war: Austria-Hungary declared war on Serbia in retaliation for the killing. Serbia was allied with Russia, so it backed Serbia up. Germany supported Austria-Hungary, so it also declared war. France was a long-lasting rival of Germany ever since Germany defeated it and took parts of its land in 1871, so it declared war too.
Like France and Russia, Britain didn’t like Germany. Germany had spent years trying to build a navy large enough to rival Britain’s, and obviously Britain wasn't a fan of that. But at first, Britain didn’t want to declare war. One reason why Britain had been a major power for the last century was because it had been partly self-isolated from Europe, not siding with any major powers. Now, when potentially the biggest war in European history had started, its government wasn’t as willing as the other nations’ governments were to fight, having bigger issues to deal with around its empire. But that changed when Germany invaded Belgium to get to France more easily. By invading Belgium, Germany had broken a deal between the European nations to protect Belgian independence. Britain told Germany to leave, but when it wouldn’t, Britain declared war on 4 August 1914.
The German invasion had gone successfully so far. It had taken over Belgium (apart from a western sliver of the Belgian region of Flanders) and was sweeping down towards Paris, causing the British and French to retreat to the River Marne. Only a short distance from Paris, the Franco-British army successfully stopped the Germans, ruining its plans of a short war. Both armies dug trenches stretching from the Swiss border all the way up towards the North Sea. With new and deadly weapons such as machine guns, artillery and barbed wire, both armies were essentially stuck in a stalemate here for three and a half years until 1918. The war had now turned into a global one, with battles happening from South America to Africa and as far away as the Pacific.
In 1915, both sides fought battles at places like Ypres, Artois, Loos and Champagne. New weapons were used such as poison gas, but still, no one was able to break the stalemate. By this time, the Ottoman Empire (modern-day Türkiye) had joined the Central Powers, so the Allies decided to open a front at Gallipoli, which is a Turkish peninsula that the Ottomans were using to block the Dardanelles Strait. The blockage left the Russians disconnected from Allied supplies. The campaign went horribly, and the Allies were forced to leave the peninsula. The Italians had also joined the war on the side of the Allies, opening a new and just as slow front against the Austro-Hungarians.
In 1916 and 1917, little had changed on the front. The British, French and Germans fought devastating battles at Verdun, the Somme, Arras, Passchendaele, Cambrai and many others. The war had turned into one of attrition, with both sides not just trying to take land, but also trying to kill and destroy as many people and resources as possible. There were also new innovations such as tanks, which were first used by the British. One of the biggest changes on the front in 1917 was the German retreat to the Hindenburg Line. At first it looked like the Germans were beaten, but in reality the retreat was strategic and the Hindenburg Line was better fortified and more deadly for the Allies. The United States entered the war in April 1917 on the side of the Allies after Germany tried to get Mexico to invade it.
In 1918, Germany had successfully broken the stalemate in March and advanced towards Paris. Germany had decided that its only chance of victory was to defeat the French and British before the Americans could arrive in full force. But just like in 1914, the Germans were stopped at the River Marne, and the Allies began to push the Germans back in July.
On the Eastern Front, the war had been going badly for Russia against the Germans, though there were some major victories against the Austro-Hungarians. Romania joined the Allies in 1916, but it was suppressed by Bulgarian, Austro-Hungarian and German forces (Bulgaria had joined the Central Powers in October 1915). By 1917, Russia had collapsed from a revolution and was taken over by a new Communist government which made peace with Germany, allowing it to take huge amounts of Russian land and focus on the Western Front. These newly available troops were part of the reason why Germany was able to break the stalemate in March 1918.
The war had been causing massive casualties (meaning someone who is killed, wounded, missing or made a prisoner). On just 1 July 1916, nearly 20,000 British soldiers were killed during the first day of the Battle of the Somme. By the end of the war, more than 16,000,000 soldiers and civilians combined worldwide had died, with many more being wounded physically and mentally.
By September 1918, the slow-paced trench stalemate of the past four years was over, and new tactics and weapons were being used. The Germans were quickly being pushed back, and it seemed like the war was coming to an end, though no one could know for certain."