Question: when did germany declare war on russia ww1

title: Timeline of World War I
text: Dates Events January 5 -- 17 Austro - Hungarian offensive against Montenegro , which capitulates . Details January 6 -- 7 Battle of Mojkovac January 6 -- 8 Battle of Sheikh Sa'ad , a phase of the First Siege of Kut . January 9 The Gallipoli Campaign ends in an Allied defeat and an Ottoman victory . Details January 10 -- February 16 Battle of Erzurum . January 11 Corfu occupied by the Allies . Details January 13 Battle of Wadi , a phase of the First Siege of Kut . Details January 21 Battle of Hanna , a phase of the First Siege of Kut . January 24 Reinhard Scheer is appointed commander of Germany 's Hochseeflotte . Details January 27 Conscription introduced in the United Kingdom by the Military Service Act 1916 . Details February 5 -- April 15 Trebizond Campaign . February 12 Battle of Salaita Hill . February 21 The Battle of Verdun begins . February 26 Battle of Agagia , Senussi rebellion suppressed by the British . February 28 German Kamerun ( Cameroon ) surrenders . Details March 1 Germany resumes unrestricted submarine warfare . Details March 1 -- 15 Fifth Battle of the Isonzo . March 2 -- August 4 Battle of Bitlis . March 8 Battle of Dujaila : a British attempt to relieve Kut failed . Details March 9 Germany declares war on Portugal . Portugal officially enters the war . Details March 11 -- 12 Battle of Latema Nek . March 14 The Manifesto of the Sixteen , declaring Kropotkinist - anarchist support of the Allied war effort , is published . Details March 18 Battle of Kahe . March 18 -- April Lake Naroch Offensive . April 24 -- 29 Easter Rising by Irish rebels for independence from the United Kingdom . Details April 24 -- 30 The Kienthal Conference , the second meeting of the anti-war socialist Zimmerwald Movement , is held in Kienthal , Switzerland . Details April 27 -- 29 Gas attacks at Hulluch . April 29 The British forces under siege at Kut surrender to the Ottomans , first siege of Kut ends . Details May 7 -- 10 Battle of Kondoa Irangi . May 10 Germany suspends unrestricted submarine warfare . Details May 15 -- June 10 Austro - Hungarian Strafexpedition in Trentino . Details May 16 Signing of the Sykes - Picot Agreement between Britain and France defining their proposed spheres in the Middle East . Details May 31 -- June 1 Battle of Jutland between Britain 's Grand Fleet and Germany 's Hochseeflotte . Details June 2 -- 14 Battle of Mont Sorrel . June 4 The Brusilov Offensive begins . June 5 The Arab Revolt in Hejaz begins . Details The HMS Hampshire is sunk off the Orkney Islands ; Lord Kitchener dies . Details June 10 Italy : Paolo Boselli succeeds Antonio Salandra as Prime Minister . Details The Siege of Medina begins . June 10 -- July 4 Battle of Mecca , Arabs capture the city . Details June 30 Battle of the Boar 's Head , diversion from the Battle of the Somme which began the next day . July Battle of Taif . Details July 1 The Battle of the Somme begins . Details July 1 -- 3 The Social Democratic Party wins a majority in the parliament of the Russian - ruled Grand Duchy of Finland . Details July 1 -- 13 Second Battle of Albert ( Opening phase of the Battle of the Somme ) . Details July 1 -- 2 British capture Fricourt during the Second Battle of Albert . Details July 2 -- 25 Battle of Erzincan . July 3 -- 7 British capture La Boisselle during the Second Battle of Albert . Details July 3 -- 12 British capture Mametz Wood during the Second Battle of Albert . Details July 3 -- 17 British capture Ovillers during the Second Battle of Albert and Battle of Bazentin Ridge . Details July 4 -- 6 Battle of Kostiuchnowka . July 7 -- 11 British capture Contalmaison during the Second Battle of Albert . Details July 8 -- 14 British capture Trônes Wood during the Second Battle of Albert . Details July 14 -- 17 Battle of Bazentin Ridge ( Initial phase of the Battle of the Somme ) Details July 14 -- September 15 Battles for Longueval and Delville Wood ( Initial phase of the Battle of the Somme ) Details July 19 -- 20 Battle of Fromelles ( Initial phase of the Battle of the Somme ) . July 23 -- August 7 Battle of Pozières ( Initial phase of the Battle of the Somme ) Details July 24 -- August 8 Battle of Kowel . August 3 -- 5 Battle of Romani . Ottoman attack on the British in the Sinai peninsula fails . Details August 6 -- 17 Sixth Battle of the Isonzo . The Italians capture Gorizia ( August 9 ) . Details August 6 Battle of Doberdo , part of the Sixth Battle of Isonzo . August 9 -- 18 First battle of Doiran . Details August 24 Battle of Mlali . August 27 Romania enters the war on the Entente 's side . Her army is defeated in a few weeks . August 27 -- December Conquest of Romania by Central Powers . Details August 27 -- November 26 Battle of Transylvania , a phase of the conquest of Romania . August 28 Italy declares war on Germany . August 29 Paul von Hindenburg replaces Erich von Falkenhayn as German Chief of Staff . Details September 2 -- 6 Battle of Turtucaia , a phase of the conquest of Romania . September 3 -- 6 Battle of Guillemont ( intermediate phase of the Battle of the Somme ) Details September 5 -- 7 Battle of Dobrich , a phase of the conquest of Romania . September 6 The Central Powers create a unified command . September 7 -- 11 Battle of Kisaki . September 9 Battle of Ginchy ( intermediate phase of the Battle of the Somme ) Details September 12 -- December 11 Monastir Offensive , set up of the Salonika Front . September 12 -- 14 Battle of Malka Nidzhe , a phase of the Monastir Offensive . September 12 -- 30 Battle of Kaymakchalan , a phase of the Monastir Offensive . September 14 -- 17 Seventh Battle of the Isonzo September 15 -- 22 Battle of Flers - Courcelette ; the British use armored tanks for the first time in history . Details September 17 -- 19 First Battle of Cobadin , a phase of the conquest of Romania . September 20 The Brusilov Offensive ends with a substantial Russian success . Details September 25 -- 28 Battle of Morval ( part of the final stages of the Battle of the Somme ) Details September 26 -- 28 Battle of Thiepval Ridge ( part of the final stages of the Battle of the Somme ) Details September 29 -- October 5 Flamanda Offensive , a phase of the conquest of Romania . October -- November First Battle of the Cerna Bend , a phase of the Monastir Offensive . Details October 1 -- November 5 Battle of Le Transloy ( last stage of the Battle of the Somme ) Details October 1 -- November 11 Battle of Ancre Heights ( last stage of the Battle of the Somme ) . October 9 -- 12 Eighth Battle of the Isonzo . October 19 -- 25 Second Battle of Cobadin , a phase of the conquest of Romania . October 24 The French recapture Fort Douaumont near Verdun . Details November 1 -- 4 Ninth Battle of the Isonzo . November 13 -- 18 Battle of the Ancre ( closing phase of the Battle of the Somme ) Details November 18 The Battle of the Somme ends with enormous casualties and an Anglo - French advantage . Details November 21 HMHS Britannic sinks after hitting a German mine Details Francis Joseph I , Emperor of Austria and King of Hungary , dies and is succeeded by Charles I . Details November 25 David Beatty replaces John Jellicoe as commander of the Grand Fleet . Jellicoe becomes First Lord of the Sea . Details November 25 -- December 3 Battle of Bucharest , a phase of the conquest of Romania . November 28 Prunaru Charge , a phase of the Battle of Bucharest , Romanian cavalry desperately charge into enemy lines . December 1 Battle of the Arges , a phase of the Battle of Bucharest . December 1 -- January 18 , 1917 Allies capture Yanbu . Details December 5 -- 7 United Kingdom : Prime Minister H.H. Asquith resigns and is succeeded by David Lloyd George . Details December 6 The Germans occupy Bucharest . The capital of Romania moved to Iaşi . Details December 13 Robert Nivelle replaces Joseph Joffre as Commander - in - Chief of the French Army . Details December 18 Battle of Verdun ends with enormous casualties on both sides . December 23 Battle of Magdhaba in the Sinai peninsula . Details December 23 -- 29 Christmas Battles . December 27 Togoland is divided into British and French administrative zones . Details December 29 Grigori Rasputin , Russia 's éminence grise , is assassinated . Details