The Champagne offensive is still going on the Western Front without any side gaining a decisive advantage. In the Caucasus, Enver Pasha is showing how far he's willing to go to achieve his goals. Against his military advisors’ recommendations, he decides to send more and more troops to Sarikamish. Without supplies and with temperatures constantly below -20 degrees, thousands of Ottoman soldiers freeze to death before even reaching the frontline. When the Russians finally encircle the Ottoman troops, defeat is inevitable.

The Austro-Hungarian army resembles a better militia after six months into the war. The defeats against Serbia and Russia and still under siege in Galicia - the forces are in dire straits. Many casualties, especially among the officers, mean that an effective warfare is impossible. And all this while the Russians are close to entering the Hungarian plains. On another front, the Rtussians are winning the battle of Sarikamish which ends in a disaster for the Ottoman Empire. On the Western Front, each side still tries to gain a decisive advantage.

French general Joseph Joffre is stuck in a dilemma: the Champagne offensive has been going on for weeks now - without any of the expected results. Should he dig in and tolerate the enemy on French soil? Or should his soldiers continue to run up against the impenetrable German defences? Meanwhile, South African troops attack German South West Africa and in London, Winston Churchill's plan for an invasion of the Dardanelles has been approved.

For a decisive advantage on the Western Front, the military commanders of both sides are trying to use technological advances. And so this week, German Zeppelins are flying their first air raids on English towns. Winston Churchill is outlining his ideas for what would later become the tank. Meanwhile at the Western Front, the soldier Adolf Hitler is thinking about how this war is going to continue.

Konrad von Hötzendorf has to prevent the Russian army from entering the Hungarian plains. He starts a huge offensive in the Carpathian Mountains - in mid winter. He also wants to demonstrate his power to Italy and Romania who are considering entering the war for the Entente. Meanwhile, in the North Sea the first Battle of Dogger Bank takes place which leads to the sinking of the German ship SMS Blücher.

After more than 6 months of stalemate, the German Empire is playing two new cards to gain a decisive advantage. On the Eastern Front, the Germans use gas on a huge scale for the first time. While the attack fails, the foundation for gas warfare is laid. At the same time Kaiser Wilhelm II agrees to unrestricted submarine warfare – any ship can be sank at any time.

This week, well over 1 million soldiers are on the advance everywhere in Europe. General Hindenburgs tries to beat the Russians once and for all at the Masurian Lakes. Austria-Hungary is fighting the Russians with German support in the Carpathian mountains and on the Western Front the Champagne offensive is still going.

After more than six months of war, the first big mutiny breaks out in Singapore. The endless battles in which big powers sacrifice thousands of soldiers are leading to an organised resistance for the first time. Indian troops refuse to board a ship because they don't want to fight other muslims in the Middle East. Meanwhile, Paul von Hindenburg encircles the Russians on the Eastern Front and they almost suffer a defeat as they did in Tannenberg 1914.

To break up the stalemate and get a decisive advantage, France and Great Britain open up yet another theatre of war in the Dardanelles. The plan is to seize the strait and open eventually open up the Bosporus in order to ship supplies to the Eastern and Balkan front. And so begins the naval bombardment of ottoman forts as prelude to a big offensive which will we know to today as Gallipoli.

Modern war already took place in the sky and under water but the waring nations also wanted to gain an advantage in the trenches. So this week, we see the first use of another merciless invention on the battlefield: the flame thrower. The battles on the Western Front, in the Carpathian's and near the Dardanelles continued nonetheless.

The British Expeditionary Forces are starting their first major offensive since the beginning of trench warfare. Near Neuve-Chapelle they attack the Germans and try to "bite and hold" their position. This battle will be the blueprint for future British offensives. On the Balkan, Serbia is facing a different enemy: Typhus. The catastrophic sanitary conditions enable the disease to spread across the whole country.

Even though the Entente offensive near Constantinople didn't really take off yet, the allied powers were already dreaming about splitting up the Ottoman Empire between themselves - and even promised territory to other nations. In the meantime, Austria-Hungary started its third offensive in the Carpathians to free the besieged army in Galicia.

The generals at the Western Front are slowly starting to adapt to the modern war. The battle of Neuve-Chappelle will be a blueprint for future operations and further improvements are supposed to finally bring the decisive advantage. In the meantime, after 133 days, the fortress of Przemyśl capitulates - the longest siege of World War 1.

The Ottoman Navy is finally able to fend off the Russian and Royal Navies in the Dardanelles, Bulgaria is considering joining the Central Powers, Austria-Hungary is fighting off the Russians in Galicia and the German start a new offensive in the Baltics. All in one busy week of spring 1915.

The leaders of the Ottoman Empire are looking for a scapegoat after their collosal defeat in the Caucasian Mountains a few month earlier. They start the systematic relocation and disarm Armenian troops among their ranks to end all calls for Armenian independence. Today's estimates place the death toll of the genocide up till 1.5 million men, women and children.

This week, generals on three different fronts show that they are not able to realise their mistakes. Basra falls to the British, the quick victory at the Dardanelles is getting more and more unlikely and the Russians are loosing their advantage in the Carpathians. But not the commanders have to pay the price for their mistakes, the soldiers have to.

fter experiments on the Eastern Front, the German Army is using poison gas for the first time on the Western Front. At the beginning of the 2nd Battle of Ypres, the wind blows in a favourable direction; the wide spread use of chlorine gas has a devastating effect on the French troops. Even the Germans are surprised by it. The incredible sacrifice of the Canadian troops make it possible to defend Hill 60 in the end.

Completely underestimating the Ottoman army at the Dardanelles, the British commanders decide to let the ANZACs take the Gallipoli peninsular as a gateway to the Bosporus and Constantinople. After the landing in ANZAC Cove and on Z Beach one thing comes clear though: Mustafa Kemal and his troops will fight for every inch of this piece of rock.

Ignoring the warnings and cruising carelessly slow the RMS Lusitania is hit by a torpedo of the German U-Boat U20. Almost 2000 people die during the sinking of the Lusitania. At the same time the German and Austro-Hungarian army start a combined surprise offensive in the Carpathians. The Gorlice-Tarnów Offensive is a huge success for German commander August von Mackensen.

The 2nd Battle of Ypres is still going but no side can gain a decisive advantage. The main reason on the British side is a lack of artillery ammunition. Even the delivered shells are not working correctly. But even the German supply lines are stretched thin. At the same time German South-West Africa falls to South African troops under Louis Botha.

The big success of the Gallipoli Campaign never came, thousands of soldiers died and so Winston Churchill is forced to resign. At the same time August von Mackensen is pushing back the Russians and forcing them to hide in Przemyśl fortress - the same fortress they just conquered from the Austro-Hungarians a few weeks earlier.

After the defeats of Austria-Hungary against Russia, Italy is seeing her chance to grab disputed territories from them. Even though they are not prepared for a full scale war economically or militarily, the declare war against the Central Powers. So, just one month after the landing at Gallipoli, yet another front is opened in Europe. Meanwhile the Russians are still on the run from August von Mackensen and in Gallipoli the fighting stops to collect the dead.

When Przemysl falls for the 2nd time and when the British and ANZAC troops fail at Gallipoli again, one thing becomes clear: Artillery is the key for future battles. August von Mackensen had used it with great success at the Gorlice-Tarnow-Offensive and the French even diverted one million men to shell factories. Meanwhile German Zeppelins bombed London and the US sent submarines for aid.

Reginald Warneford is important to Britain's war effort. Not just because he shot down a German zeppelin, but because he is made a hero in times when heroes are needed. He receives a Victoria Cross soon after his victory because the commanders know about the average life span of pilots in World War 1. Meanwhile, the Austro-Hungarian army digs into the alpine rocks to fend of the Italian Attackers and Gallipoli continues to be a butchery without any progress.

The war seems like a romantic novel this week: In the East the Russians are saved by Cossack Cavalry while August von Mackensen's artillery is plowing through Galicia. In the meantime, the British discover a German spy ring in London and the French gain a few miles in the west.